FCCID.CO- FCC ID Database
HomeCompaniesEquipment ClassesSearch

© 2026 FCC ID Database. All rights reserved.

AboutContactData sourced from FCC public records
  1. Home/
  2. AMOI Electronics Co., Ltd./
  3. RWZV810

RWZV810Dual Band CDMA Mobile Phone

AMOI Electronics Co., Ltd.
Dual Band CDMA Mobile Phone - FCC ID RWZV810 - AMOI Electronics Co., Ltd.
Click to zoom

Application Details

Equipment Class
PCE - PCS Licensed Transmitter held to ear
Date of Grant
Nov 08, 2005
Application Purpose
Original Equipment
Date of Application
Nov 08, 2005
Equipment Note
Dual Band CDMA Mobile Phone
Frequency Range
824.70000000 - 848.30000000
Company
AMOI Electronics Co., Ltd.
Country
China

Documents & Files

Select a file to view

Users Manual

↗

Cover Letter(s)

↗

External Photos

↗

ID Label/Location Info

↗

Internal Photos

↗

RF Exposure Info

↗
↗

Test Report

↗

Document Text

Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.

Users Manual

1 Thank you very much for choosing AMOI V810, V810 is a perfect integration of unparalleled contemporary design and consummate precise craftsmanship with powerful CDMA data service and colorful multimedia functions, bringing you easy communication, funny entertainment, as well as highlighting your tastes. Key Features: ☆ CDMA Clamshell Phone ☆ 65535 TFT main display & Tricolor OLED sub display ☆ 1.3 mega pixel rotational camera ☆ SMS: Short Messaging Service ☆ AMOI Smart Dial ☆ Phonebook memory of 1000 entries ☆ Support SMS / Broadcast / Voice Mail ☆ TransFlash Card (T Card) Slot ☆ Audio & Video Streaming (MP3 & MPEG-4) ☆ USB 2.0, Bluetooth ☆ 72 Polyphonic Ring Tones Specifications: CDMA 800/1900 MHz Voice encoding: FR / EFR / HR 2 Screen: Internal: 2.0 inch, 65k colors TFT display (176 x 220 pixels) External: 0.9 inch, Tri-color OLED display (96 x 64 pixels) Dimension: 96.4mm x 50mm x 27.4mm Weight: 120 g Battery capacity: 1100 mAh Standby time: 60-100 hrs Talk time: 2-3 hrs The manufacturer may, at any time and without notice, make changes or improvements to the products offered, but provide necessary corrigendum with this manual or release new version of this manual for the following lot. The Amoi logo and trademark are the property of the manufacturer. Sep. 2005. Intellectual Property All Intellectual Property, as defined below, owned by or which is otherwise the property of Amoi or its respective suppliers relating to the Amoi Phone, including but not limited to, accessories, parts, or software relating thereto (the “Phone System”), is proprietary to Amoi and protected under federal laws, state laws, and international treaty provisions. Intellectual Property includes, but is not limited to, inventions (patentable or unpatentable), patents, trade secrets, copyrights, software, computer programs, and related documentation 3 and other works of authorship. You may not infringe or otherwise violate the rights secured by the Intellectual Property. Moreover, you agree that you will not (and will not attempt to) modify, prepare derivative works of, reverse engineer, decompile, disassemble, or otherwise attempt to create source code from the software. No title to or ownership in the Intellectual Property is transferred to you. All applicable rights of the Intellectual Property shall remain with Amoi and its suppliers. 4 TABLE OF CONTENTS Safety precautions...................................................1 Your Phone.........................................................16 Open view.........................................................16 Phone Layout....................................................... 16 Closed view.........................................................17 Rear view..........................................................17 Keys Description..................................................18 Shortcut Keys........................................................19 Display Layout......................................................20 Getting Started....................................................22 Install a UIM Card...........................................23 Charge a Battery.................................................24 Switch the Phone On/Off.......................................26 Switch networks.....................................................27 Your Phone’s Mode....................................................28 Call Function.....................................................29 Make a Call.....................................................29 Receive or reject a Call.....................................29 Adjust call volume..................................................31 5 Missed Calls.........................................................32 Call Menu...........................................................32 Entering Text.......................................................33 Change Text Input Mode...................................33 Insert Symbol......................................................33 Insert Template............................................................34 Insert Phone no......................................................34 Dictionary............................................................35 English Mode..........................................................35 Abc Mode........................................................... 36 123 Mode............................................................38 Copy..................................................................38 Paste..................................................................38 Net symbol...........................................................39 Use of the Menu.............................................40 Access a Menu Function......................................40 List of Menu Functions ..................................................41 Phonebook......................................................42 Speed search.........................................................42 View..............................................................42 Search....................................................... .........43 6 Add...............................................................43 Caller Groups......................................................44 Phonebook Manager...................................................45 Info....................................................................46 Messages...............................................................47 SMS ................................................................47 New Message.........................................................................48 Inbox.......................................................................................49 Outbox....................................................................................51 Draft Box................................................................................52 Templates...............…

Text truncated - open the document above for the full version.

External Photos

EXHIBIT C - EUT EXTERNAL PHOTOGRAPHS EUT Front View EUT Rear View EUT Flip Open View EUT Port View Battery Charger

ID Label/Location Info

EXHIBIT A - FCC ID LABELING AND WARNING STATEMENT Proposed FCC ID Label Specifications: Text is black or white in color and is left justified. Labels are silk-screened and shall be “permanently affixed” at a conspicuous location on the EUT. Proposed Label Location on EUT EUT Battery Cover off View of the EUT/ID Label Location FCC Warning Statement A FCC Warning Statement is provided in the product manual. FCC ID: RWZV810

Internal Photos

EXHIBIT C - EUT INTERNAL PHOTOGRAPHS EUT Battery Cover Off View EUT Cover Off View EUT Component View 1 EUT Component View 2 EUT Display Cover off View Display Component View 1 Display Component View 2 Keyboard Component View Keyboard Solder View Antenna

RF Exposure Info

Note: This test report is specially limited to the above client company and this particular sample only. It may not be duplicated without prior written consent of Bay Area Compliance Laboratory Corporation. This report must not be used by the client to claim product certification, approval, or endorsement by NVLAP, NIST or any agency of the U.S. Government. SAR EVALUATION REPORT For Amoi Electronics Co., Ltd NO.45,Tiyu road,Xiamen,Fujian,China 361012 FCC ID: RWZV810 This Report Concerns: Original Report Equipment Type: CDMA DIGITAL MOBILE PHONE Test Engineer: Daniel Du / Report No.: R0511011S Report Date: 2005-11-07 Reviewed By: Richard Lee / Prepared By: Bay Area Compliance Laboratory Corporation (BACL) 230 Commercial Street Sunnyvale, CA 94085 Tel: (408) 732-9162 Fax: (408) 732 9164 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 2 of 83 DECLARATION OF COMPLIANCE SAR EVALUATION Rule Part(s): FCC §2.1093 Test Procedure(s): FCC OET Bulletin 65 Supplement C & IEEE 1528 Device Classification: Licensed Portable Transmitter Device Type: CDMA DIGITAL MOBILE PHONE FCC ID: RWZV810 Modulation: CDMA TX Frequency Range: 824.7~848.3MHz, 1851.25~1908.75MHz Max. Conducted Power Tested: 24.08dBm (836.52MHz), 23.68dBm (1880.0MHz) Antenna Type(s): Integral Antenna Body-Worn Accessories: None Face-Head Accessories: None CDMA Cellular Band: Max. SAR Level(s) Measured: 0.041 mW/g (Body-Worn); 0.046 mW/g (Head); CDMA PCS Band: Max. SAR Level(s) Measured: 0.396 mW/g (Body-Worn); 0.675 mW/g (Head); BACL Corp. declares under its sole responsibility that this wireless portable device has been determined to be in compliance for localized specific absorption rate (SAR) for uncontrolled exposure and general population exposure limits specified in EN 50361:2001 and has been tested in accordance with the measurement procedures specified in FCC OET Bulletin 65 Supplement C and ANSI IEEE C95.3:2002 All measurements reported herein were performed under my supervision and believed to be accurate to the best of my knowledge. I further attest for the completeness of these measurements and vouch for the qualifications any and all personnel performing such measurements. The results and statements contained in this report pertain only to the device(s) evaluated. /signature/ Richard Lee Bay Area Compliance Laboratory Corp. Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 3 of 83 TABLE OF CONTENTS REFERENCE, STANDARDS, AND GUILDELINES ...............................................................................................5 SAR LIMITS.................................................................................................................................................................6 EUT DESCRIPTION ....................................................................................................................................................7 DESCRIPTION OF TEST SYSTEM ..........................................................................................................................8 MEASUREMENT SYSTEM DIAGRAM...........................................................................................................................10 SYSTEM COMPONENTS...............................................................................................................................................12 TESTING EQUIPMENT............................................................................................................................................21 EQUIPMENTS LIST & CALIBRATION INFO...................................................................................................................21 SAR MEASUREMENT SYSTEM VERIFICATION ..............................................................................................22 SYSTEM ACCURACY VERIFICATION...........................................................................................................................22 EUT TEST STRATEGY AND METHODOLOGY .................................................................................................24 SAR EVALUATION PROCEDURE.................................................................................................................................24 CONCLUSION ............................................................................................................................................................25 SAR BODY WORST-CASE TEST DATA.......................................................................................................................25 APPENDIX A – MEASUREMENT UNCERTAINTY ............................................................................................26 APPENDIX B – PROBE CALIBRATION CERTIFICATES .................................................................................28 APPENDIX C – DIPOLE CALIBRATION CERTIFICATES ...............................................................................39 APPENDIX D - TEST SYSTEM VERIFICATIONS SCANS .................................................................................55 LIQUID MEASUREMENT RESULT................................................................................................................................55 APPENDIX E - EUT SCANS .....................................................................................................................................60 APPENDIX F – CONDUCTED OUTPUT POWER MEASUREMENT ...............................................................70 PROVISION APPLICABLE.............................................................................................................................................70 TEST PROCEDURE......................................................................................................................................................70 TEST EQUIPMENT..................................................................................…

Text truncated - open the document above for the full version.

RF Exposure Info

Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 42 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 43 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 44 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 45 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 46 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 47 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 48 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 49 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 50 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 51 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 52 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 53 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 54 of 83 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 55 of 83 APPENDIX D - TEST SYSTEM VERIFICATIONS SCANS Liquid Measurement Result 2005-11-03 Simulant Freq [MHz] Parameters Liquid Temp [ºC] Target Value Measured Value Deviation Limits [%] ε r 22.0 55.2 56.0 1.45 ±5 σ 22.0 0.97 0.97 0 ±5 Body 835 1g SAR 22.0 8.848 9.42 6.46 ±10 ε r 22.0 41.5 41.6 0.24 ±5 σ 22.0 0.90 0.90 0 ±5 Head 835 1g SAR 22.0 9.5 9.29 -2.21 ±10 ε r = relative permittivity, σ = conductivity and ρ=1000kg/m 3 2005-11-04 Simulant Freq [MHz] Parameters Liquid Temp [ºC] Target Value Measured Value Deviation Limits [%] ε r 22.0 53.3 51.4 -3.56 ±5 σ 22.0 1.52 1.59 4.61 ±5 Body 1900 1g SAR 22.0 24.97 26.0 4.12 ±10 ε r 22.0 40.0 39.5 -1.25 ±5 σ 22.0 1.4 1.37 -2.14 ±5 Head 1900 1g SAR 22.0 39.7 37.0 -6.8 ±10 ε r = relative permittivity, σ = conductivity and ρ=1000kg/m 3 Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 56 of 83 Date/Time: 11/3/2005 2:52:13 PM Test Laboratory: Bay Area Compliance Lab Corp. SystemValidationCheck_D835_Body DUT: Dipole 900 MHz; Type: D900V2; Serial: D900V2 - SN:122 Communication System: CW; Frequency: 835 MHz;Duty Cycle: 1:1 Medium parameters used: f = 835 MHz; σ = 0.97 mho/m; ε r = 56; ρ = 1000 kg/m 3 Phantom section: Flat Section DASY4 Configuration: • Probe: ET3DV6 - SN1604; ConvF(6.27, 6.27, 6.27); Calibrated: 3/18/2005 • Sensor-Surface: 4mm (Mechanical Surface Detection) • Electronics: DAE3 Sn456; Calibrated: 10/18/2005 • Phantom: SAM with CRP; Type: Twin SAM; Serial: TP-1032 • Measurement SW: DASY4, V4.6 Build 23; Postprocessing SW: SEMCAD, V1.8 Build 160 d=15mm, Pin=1W/Area Scan: Measurement grid: dx=15mm, dy=15mm Maximum value of SAR (interpolated) = 10.0 mW/g d=15mm, Pin=1W/Zoom Scan (5x5x5): Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 107.1 V/m; Power Drift = -0.067 dB Peak SAR (extrapolated) = 14.7 W/kg SAR(1 g) = 9.42 mW/g; SAR(10 g) = 5.87 mW/g Maximum value of SAR (measured) = 10.3 mW/g 0 dB = 10.3mW/g Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 57 of 83 Date/Time: 11/3/2005 10:07:29 AM Test Laboratory: Bay Area Compliance Lab Corp. SystemValidationCheck_D835_Head DUT: Dipole 900 MHz; Type: D900V2; Serial: SN:122 Communication System: CW; Frequency: 835 MHz;Duty Cycle: 1:1 Medium parameters used: f = 835 MHz; σ = 0.9 mho/m; ε r = 41.6; ρ = 1000 kg/m 3 Phantom section: Flat Section DASY4 Configuration: • Probe: ET3DV6 - SN1604; ConvF(6.62, 6.62, 6.62); Calibrated: 3/18/2005 • Sensor-Surface: 4mm (Mechanical Surface Detection) • Electronics: DAE3 Sn456; Calibrated: 10/18/2005 • Phantom: SAM with CRP; Type: Twin SAM; Serial: TP-1032 • Measurement SW: DASY4, V4.6 Build 23; Postprocessing SW: SEMCAD, V1.8 Build 160 d=15mm, Pin=1W/Area Scan: Measurement grid: dx=15mm, dy=15mm Maximum value of SAR (interpolated) = 10.1 mW/g d=15mm, Pin=1W/Zoom Scan (5x5x5): Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 112.6 V/m; Power Drift = -0.261 dB Peak SAR (extrapolated) = 14.5 W/kg SAR(1 g) = 9.29 mW/g; SAR(10 g) = 5.86 mW/g Maximum value of SAR (measured) = 10.1 mW/g 0 dB = 10.1mW/g Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 58 of 83 Date/Time: 11/4/2005 8:55:07 AM Test Laboratory: Bay Area Compliance Lab Corp. SystemValidationCheck_D1900_Body DUT: Dipole 1800 MHz; Type: D1800S2; Serial: BCL-049 Communication System: CW; Frequency: 1900 MHz;Duty Cycle: 1:1 Medium parameters used: f = 1900 MHz; σ = 1.59 mho/m; ε r = 51.4; ρ = 1000 kg/m 3 Phantom section: Flat Section DASY4 Configuration: • Probe: ET3DV6 - SN1604; ConvF(4.79, 4.79, 4.79); Calibrated: 3/18/2005 • Sensor-Surface: 4mm (Mechanical Surface Detection) • Electronics: DAE3 Sn456; Calibrated: 10/18/2005 • Phantom: SAM with CRP; Type: Twin SAM; Serial: TP-1032 • Measurement SW: DASY4, V4.6 Build 23; Postprocessing SW: SEMCAD, V1.8 Build 160 d=10mm, Pin=1W/Area Scan: Measurement grid: dx=10mm, dy=15mm Maximum value of SAR (interpolated) = 33.6 mW/g d=10mm, Pin=1W/Zoom Scan (5x5x5): Measurement grid: dx=5mm, dy=5mm, dz=5mm Reference Value = 145.3 V/m; Power Drift = -0.131 dB Peak SAR (extrapolated) = 51.2 W/kg SAR(1 g) = 26 mW/g; SAR(10 g) = 12.5 mW/g Maximum value of SAR (measured) = 29.4 mW/g 0 dB = 29.4mW/g Amoi Electronics Co., Ltd FCC ID: RWZV810 Report #R0511011S SAR Evaluation Report Page 59 of 83 Date/Time: 11/4/2005 12:32:14 PM Test Laboratory: Bay Area Compliance Lab Corp. SystemValidationCheck_D1900_Head DUT: Dipole 1800 MHz; Type: D1800S2; Serial: BCL-049 Communication System: CW; Frequency: 1900 MHz;Duty Cycle: 1:1 Medium parameters used: f = 1900 MHz; σ = 1.37 mho/m; ε r = 39.5; ρ = 1000 kg/m 3 Phantom section: Flat Section DA…

Text truncated - open the document above for the full version.

Test Report

Note: This test report is specially limited to the above client company and this particular sample only. It may not be duplicated without prior written consent of Bay Area Compliance Laboratory Corporation. This report must not be used by the client to claim product certification, approval, or endorsement by NVLAP, NIST or any agency of the U.S. Government. FCC PART 22, 24 TYPE APPROVALS EMI MEASUREMENT AND TEST REPORT For AMOI ELECTRONICS CO., LTD. NO.45,Tiyu road,Xiamen, Fujian,China 361012 FCC ID: RWZV810 This Report Concerns: Original Report Equipment Type: Dual Band CDMA Mobile Phone Test Engineer: Daniel Deng / Report No.: R0511011 Report Date: 2005-11-07 Reviewed By: Richard Lee / Prepared By: Bay Area Compliance Laboratory Corporation (BACL) 230 Commercial Street Sunnyvale, CA 94085 Tel: (408) 732-9162 Fax: (408) 732 9164 AMOI ELECTRONICS CO., LTD. FCC ID: RWZV810 Report # R0511011Rpt Page 2 of 34 FCC Part 22, 24 Type Approvals Report TABLE OF CONTENTS GENERAL INFORMATION.......................................................................................................................................4 PRODUCT DESCRIPTION FOR EQUIPMENT UNDER TEST (EUT) ....................................................................................4 OBJECTIVE...................................................................................................................................................................4 RELATED SUBMITTAL(S)/GRANT(S).............................................................................................................................4 TEST METHODOLOGY..................................................................................................................................................4 TEST FACILITY.............................................................................................................................................................4 SYSTEM TEST CONFIGURATION ..........................................................................................................................6 JUSTIFICATION.............................................................................................................................................................6 BLOCK DIAGRAM.........................................................................................................................................................6 EQUIPMENT MODIFICATIONS.......................................................................................................................................6 LOCAL SUPPORT EQUIPMENT LIST AND DETAILS........................................................................................................6 POWER SUPPLY............................................................................................................................................................6 SUMMARY OF TEST RESULTS ...............................................................................................................................7 §2.1047 - MODULATION CHARACTERISTIC .......................................................................................................8 APPLICABLE STANDARD..............................................................................................................................................8 TEST PROCEDURE........................................................................................................................................................8 TEST EQUIPMENT LIST AND DETAILS...........................................................................................................................8 ENVIRONMENTAL CONDITIONS....................................................................................................................................8 TEST RESULTS.............................................................................................................................................................8 §2.1053 - SPURIOUS RADIATED EMISSIONS .....................................................................................................12 APPLICABLE STANDARD............................................................................................................................................12 TEST PROCEDURE......................................................................................................................................................12 TEST EQUIPMENT LIST AND DETAILS.........................................................................................................................12 ENVIRONMENTAL CONDITIONS..................................................................................................................................12 TEST RESULT.............................................................................................................................................................13 §2.1046, §22.913(A), & §24.232 – RF OUTPUT POWER........................................................................................14 APPLICABLE STANDARD............................................................................................................................................14 TEST PROCEDURE......................................................................................................................................................14 TEST EQUIPMENT LIST AND DETAILS.........................................................................................................................15 ENVIRONMENTAL CONDITIONS..................................................................................................................................15 TEST RESULTS...........................................................................................................................................................16 §2.1049, §22.917, §22.905, & §24.238 - OCCUPIED BANDWIDTH ............................…

Text truncated - open the document above for the full version.

Contact Information

Applicant

William Ding(Manager)
[email protected](86)592-5058123Fax: (86)592-509-1166

Test Firm

Bay Area Compliance LaboratoryJohn Chan
[email protected]408-732-9162Fax: 408-732-9164

Technical Specifications

#Rule PartsFrequency RangePower OutputEmissionTolerance
222H824.7 MHz - 848.3 MHz255.00 mW1M25F9W2.5 ppm
Confidentiality
Long Term
Grant Notes
Power listed is EIRP for Part 24 and ERP for Part 22. This filing is only applicable for 800 MHz and 1900 MHz operations. SAR compliance for body-worn operating configurations is limited to the specific belt -clips/holsters/accessories tested for this filing. End-users must be informed of the body-worn operating requirements for satisfying RF exposure compliance. Highest reported SAR are Pt 24 head: 0.675 W/kg and body: 0.396 W/kg; and Part 22 Head: 0.046 W/kg and body: 0.041 W/kg.

Other Applications from AMOI Electronics Co., Ltd.

PCS1900 (Mobile Phone) - FCC ID RWZ-N810 - AMOI Electronics Co., Ltd.
RWZ-N810

PCS1900 (Mobile Phone)

Nov 11, 2007

Equipment Class

PCF - PCS Licensed Transmitter held to face
GSM850 AND PCS1900 (Mobile Phone) - FCC ID RWZ-SMT5700WOC - AMOI Electronics Co., Ltd.
RWZ-SMT5700WOC

GSM850 AND PCS1900 (Mobile Phone)

Sep 09, 2007

Equipment Class

DSS - Part 15 Spread Spectrum Transmitter
CDMA 1X EVDO/GSM Digital Mobile Phone - FCC ID RWZV870 - AMOI Electronics Co., Ltd.
RWZV870

CDMA 1X EVDO/GSM Digital Mobile Phone

Apr 24, 2007

Equipment Class

PCE - PCS Licensed Transmitter held to ear
GSM850 AND PCS1900 (Mobile Phone) - FCC ID RWZ-6711 - AMOI Electronics Co., Ltd.
RWZ-6711

GSM850 AND PCS1900 (Mobile Phone)

Mar 15, 2007

Equipment Class

PCE - PCS Licensed Transmitter held to ear
Tri Band GSM Mobile Phone - FCC ID RWZ-A320A - AMOI Electronics Co., Ltd.
RWZ-A320A

Tri Band GSM Mobile Phone

Dec 22, 2005

Equipment Class

PCE - PCS Licensed Transmitter held to ear