2ALHZ20Bluetooth Headset

KTW-20 User Manual Package box Included: Earbuds X 1 set Charging case X 1 Manual X 1 Micro USB Charging Cable X 1 1. Power on Open the charging case and take the earbuds out, which will be powered on automatically. LED indicators of the earbuds will flash white four times. You will hear "power on". 2. Power off Put the earbuds into the charging case, which will be powered off automatically and be recharged. LED indicators of the earbuds will be in red. 3. Pairing and connection When the earbuds is powered on, the earbuds will connect each other automatically. There is a prompt voice” di”. Turn on the bluetooth function of the device and find the pairing ID “KTW-20”, click it to connect. There is a prompt voice “connected” from one of the earbud. (No pairing password is required (for some devices that require pairing password, please enter 0000 for password connection).When the bluetooth disconnected from the earbuds, you will hear "disconnected, pairing". In pairing mode, the earbuds will power off automatically, if it can’t be connected with bluetooth device in 5 minutes. 4. Calls Answer a call: Click the MFB on Left/Right earbud End a call: Click the MFB on Left/Right earbud Reject a call: Press and hold the MFB on Left/Right earbud 2 seconds Redial a call: Click the MFB on Left/Right earbud thrice continuously. 5. Play/Pause music Click the MFB on Left/Right earbud to play/pause music. 6. Next song Click the MFB on Right earbud twice continuously. 7. Previous song Click the MFB on Left earbud twice continuously. 8. Active Siri Press and hold the MFB on Left/Right earbud for 3 seconds and to active siri function, there is a prompt tone “Dong”. 9. Low Battery Warning: At power on condition, the LED indicators on the earbuds will flash red fast, and you will hear the warning tone "battery Low". 10. Charging: 1) Earbuds charging Magnetic contact recharging, put the earbuds into charging case, which will be charged automatically, the LED indicators of the earbuds stay on red, and it will turn off when the earbuds were fully charged. 2) Charge the charging case Use adapter to charge the charging case, the LED indicators of the charging case stay on white. All indicator on charging case will be white, when it is fully charged. Note: The bluetooth earbuds and charging case must be fully charged before first time to use. 11. Reset Take out the earbuds from charging case, press and hold the MFB on Left and Right earbuds at the same time about 10 seconds. The LED indicators on earbuds will flash white twice,and reset successfully. Specifications Common Issues and Solutions A. The phone could not find the earbuds. Solutions: 1. Check if the earbuds are powered on; whether the earbuds is under pairing mode or not. (Pairing mode: one of the earbud flash red and white fast and another earbud flash white every 5s,) 2. Restart the earbuds and mobile phone Driver unit 8mm Neodymium Impedance 32Ω Driver unit Frequency 20Hz-20K Hz Bluetooth edition Bluetooth V5.0 Radio Frequency coverage 2.402GHZ~2.480 GHZ Transmit Range ≤10m (barrier free) Charge DC 5V/1A charger Charging time of earbuds 1 hour Charging Time of charging case Around 2 hours Working Time 4 hours, extra 16 hours with charging case N.W. of earbuds 4.4g*2 N.W. of charging case 47.6g 3.Clear your phone's bluetooth pairing list and try again. B. The earbuds cannot be connected to the phone. When the phone plays music, there is a sound in the right ear, but no sound in the left ear. There is something abnormal in the use of the earphone. Solutions: 1.Put the earbuds in the charging case and take it out to restart, and try to connect the phone again. 2.Reset the earbuds. C. The earbuds is always disconnected or noisy when connected to the phone. Solutions: 1.The earphone power is insufficient. It needs to be charged as soon as possible. 2.There is a barrier between the phone and the earbuds or the distance beyond the signal reception distance. Please do not cover the earphone with your hands. Keep the earbuds and phone in the same direction. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient or relocate the receiving antenna. - Increase the separation between the equipment and receiver. -Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. -Consult the dealer or an experienced radio/TV technician for help Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. FCC ID: 2ALHZ20 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

KO-STAR DEVELOPMENT CO.,LTD Sep.09, 2020 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Subject: Explanation of differences between product types FCC ID : 2ALHZ20 Model Number: KTW-20, SSX21P105KO, KTW-40, KTW-50, KTW-T6, KTW-T8, KTW-T9, KTW-T10, KTW-60, KTW-70, KTW-80, KTW-90 To Whom It May Concern: We, The KO-STAR DEVELOPMENT CO., LTD hereby declare that the model : SSX21P105KO, KTW-40, KTW-50, KTW-T6, KTW-T8, KTW-T9, KTW-T10, KTW-60, KTW-70, KTW-80, KTW-90 is identical with the model : KTW-20, except the appearance color. Except for the different above, no other modification is performed. Sincerely, Signature: KO-STAR DEVELOPMENT CO., LTD Contact person: LING YAN

KO-STAR DEVELOPMENT CO., LTD Agent Authorization Company: KO-STAR DEVELOPMENT CO., LTD Address: No.3, Yicun Industrial Area, Xikeng, Henggang Town, Longgang District Shenzhen, China Product Name: Bluetooth Headset Model Number(s): KTW-20, SSX21P105KO, KTW-40, KTW-50, KTW-T6, KTW-T8, KTW-T9, KTW-T10, KTW-60, KTW-70, KTW-80, KTW-90 Product Description: Bluetooth Headset We authorize MiCOM Labs Inc., 575 Boulder Court, Pleasanton, California 94566, USA, to act on our behalf on all matters concerning the certification of above named equipment. We declare that MiCOM Labs Inc. is allowed to forward all information related to the approval and certification of equipment to the regulatory agencies as required and to discuss any issues concerning the approval application. Any and all acts carried out by MiCOM Labs on our behalf shall have the same effect as acts of our own. Signature: Date: 2020-09-09 Name: LING YAN Company: KO-STAR DEVELOPMENT CO., LTD

KO-STAR DEVELOPMENT CO.,LTD Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 USA Date: 2020-08-28 Subject; Request for Confidentiality FCC ID: 2ALHZ20 To Whom It May Concern, Pursuant to the provisions of the Commission’s rules Title 47 Sections §0.457 and §0.459, we are requesting the Commission to withhold the following attachment(s) as confidential documents from public disclosure indefinitely. These documents contain detailed system and equipment descriptions and are considered as proprietary information in operation of the equipment. The public disclosure of these documents might be harmful to our company and would give competitors an unfair advantage in the market. Schematic Diagram Block Diagram Parts List Operational Description Tune-up Procedure In additional to above mentioned documents, in order to comply with the marketing regulations in Title 47 CFR §2.803 and the importation rules in Title 47 CFR §2.1204, while ensuring that business sensitive information remains confidential until the actual marketing of newly authorized devices, we request Short Term Confidentiality of the following attachment(s); External Photos Test Setup Photos Internal Photos User Manual For 45 days, pursuant to Public Notice DA 04-1705. OR For 180 days pursuant to KDB 726920 D01. It is our understanding that all measurement test reports, FCC ID label format and correspondence during the certification review process cannot be granted as confidential documents and this information will be available for public review once the grant of equipment authorization is issued. Sincerely KO-STAR DEVELOPMENT CO., LTD Contact person: LING YAN

External Photos WHOLE VIEW OF EUT TOP VIEW OF EUT BOTTOM VIEW OF EUT FRONT VIEW OF EUT BACK VIEW OF EUT LEFT VIEW OF EUT RIGHT VIEW OF EUT

FCC ID Label Location The product does not have enough space to place the FCC ID label, it is reflected in the user manual, as below:

Internal Photos Left OPEN VIEW OF EUT VIEW OF BATTERY INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 Antenna INTERNAL VIEW OF EUT-3 Right OPEN VIEW OF EUT VIEW OF BATTERY INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 Antenna

RF EXPOSURE EVALUATION 1. PRODUCT INFORMATION Product Description Bluetooth Headset Model Name KTW-20 FCC ID 2ALHZ20 2. EVALUATION METHOD According to 447498 D01 General RF Exposure Guidance v05 The 1-g and 10-g SAR test exclusion thresholds for 100 MHz to 6 GHz at test separation distances ≤ 50 mm are determined by: [(max. power of channel, including tune-up tolerance, mW)/(min. test separation distance, mm)] ·[√f(GHz)] ≤ 3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR. Where f(GHz) is the RF channel transmit frequency in GHz Power and distance are rounded to the nearest mW and mm before calculation 3. CALCULATION BR/EDR: P t = -0.441dBm=0.90mW The value of the Maximum output power P t is referred to the test report of the CFR47 §15.247. The result for RF exposure evaluation SAR=(0.90mW /5mm) .[√2.402GHz)]=0.28<3.0 for 1-g SAR and ≤ 7.5 for 10-g extremity SAR. 4. CONCLUSION The SAR evaluation is not required.

Page 1 of 71 FCC Test Report Report No.: AGC05177200802FE03 FCC ID : 2ALHZ20 APPLICATION PURPOSE : Original Equipment PRODUCT DESIGNATION : Bluetooth Headset BRAND NAME : N/A MODEL NAME : KTW-20, SSX21P105KO, KTW-40, KTW-50, KTW-T6, KTW-T8, KTW-T9, KTW-T10, KTW-60, KTW-70, KTW-80, KTW-90 APPLICANT : KO-STAR DEVELOPMENT CO., LTD DATE OF ISSUE : Aug. 27, 2020 STANDARD(S) : FCC Part 15.247 REPORT VERSION : V1.0 Attestation of Global Compliance (Shenzhen) Co., Ltd Report No.: AGC05177200802FE03 Page 2 of 71 REPORT REVISE RECORD Report Version Revise Time Issued Date Valid Version Notes V1.0 / Aug. 27, 2020 Valid Initial Release Report No.: AGC05177200802FE03 Page 3 of 71 TABLE OF CONTENTS 1. VERIFICATION OF CONFORMITY ............................................................................................................... 5 2. GENERAL INFORMATION ............................................................................................................................ 6 2.1. PRODUCT DESCRIPTION ..................................................................................................................... 6 2.2. TABLE OF CARRIER FREQUENCYS ..................................................................................................... 6 2.3. RECEIVER INPUT BANDWIDTH ............................................................................................................ 7 2.4. EXAMPLE OF A HOPPING SEQUENCY IN DATA MODE ....................................................................... 7 2.5. EQUALLY AVERAGE USE OF FREQUENCIES AND BEHAVIOUR ........................................................ 7 2.6. RELATED SUBMITTAL(S) / GRANT (S) .................................................................................................. 8 2.7. TEST METHODOLOGY .......................................................................................................................... 8 2.8. SPECIAL ACCESSORIES ....................................................................................................................... 8 2.9. EQUIPMENT MODIFICATIONS .............................................................................................................. 8 2.10. ANTENNA REQUIREMENT .................................................................................................................. 8 3. MEASUREMENT UNCERTAINTY ................................................................................................................. 9 4. DESCRIPTION OF TEST MODES ............................................................................................................... 10 5. SYSTEM TEST CONFIGURATION ............................................................................................................. 11 5.1. CONFIGURATION OF EUT SYSTEM .................................................................................................... 11 5.2. EQUIPMENT USED IN TESTED SYSTEM ............................................................................................. 11 5.3. SUMMARY OF TEST RESULTS ............................................................................................................. 11 6. TEST FACILITY ........................................................................................................................................... 12 7. PEAK OUTPUT POWER ............................................................................................................................. 13 7.1. MEASUREMENT PROCEDURE ........................................................................................................... 13 7.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 13 7.3. LIMITS AND MEASUREMENT RESULT ............................................................................................... 14 8. 20DB BANDWIDTH ..................................................................................................................................... 20 8.1. MEASUREMENT PROCEDURE ........................................................................................................... 20 8.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 20 8.3. LIMITS AND MEASUREMENT RESULTS ............................................................................................. 21 9. CONDUCTED SPURIOUS EMISSION ........................................................................................................ 27 9.1. MEASUREMENT PROCEDURE ........................................................................................................... 27 Report No.: AGC05177200802FE03 Page 4 of 71 9.2. TEST SET-UP (BLOCK DIAGRAM OF CONFIGURATION) ................................................................... 27 9.3. MEASUREMENT EQUIPMENT USED .................................................................................................. 27 9.4. LIMITS AND MEASUREMENT RESULT ............................................................................................... 27 10. RADIATED EMISSION ............................................................................................................................... 40 10.1. MEASUREMENT PROCEDURE ......................................................................................................... 40 10.2. TEST SETUP ....................................................................................................................................... 42 10.3. LIMITS AND MEASUREMENT RESULT ............................................................................................. 43 10.4. TEST RESULT ..................................................................................................................................... 43 11. NUMBER OF HOPPING FREQUENCY ....................................................................…

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Report No.: AGC05177200802FE03 Page 56 of 71 TEST PLOT OF MIDDLE CHANNEL Report No.: AGC05177200802FE03 Page 57 of 71 TEST PLOT OF HIGH CHANNEL Report No.: AGC05177200802FE03 Page 58 of 71 13. FREQUENCY SEPARATION 13.1. MEASUREMENT PROCEDURE The EUT shall have its hopping function enabled. Use the following spectrum analyzer settings: 1. Span: Wide enough to capture the peaks of two adjacent channels. 2. RBW: Start with the RBW set to approximately 30% of the channel spacing; adjust as necessary to best identify the center of each individual channel. 3. Video (or average) bandwidth (VBW) ≥ RBW. 4. Sweep: Auto. e) Detector function: Peak. f) Trace: Max hold. g) Allow the trace to stabilize. Use the marker-delta function to determine the separation between the peaks of the adjacent channels. 13.2. TEST SETUP (BLOCK DIAGRAM OF CONFIGURATION) Same as described in section 6.2 13.3. MEASUREMENT EQUIPMENT USED The same as described in section 6.3 13.4. LIMITS AND MEASUREMENT RESULT CHANNEL CHANNEL SEPARATION LIMIT RESULT MHz Pass CH01-CH02 0.999 >= 2/3 20 dB BW TEST PLOT FOR FREQUENCY SEPARATION Note: The GFSK modulation is the worst case and recorded in the report. Report No.: AGC05177200802FE03 Page 59 of 71 14. FCC LINE CONDUCTED EMISSION TEST 14.1. LIMITS OF LINE CONDUCTED EMISSION TEST Frequency Maximum RF Line Voltage Q.P. (dBμV) Average (dBμV) 150kHz~500kHz 66-56 56-46 500kHz~5MHz 56 46 5MHz~30MHz 60 50 Note: 1. The lower limit shall apply at the transition frequency. 2. The limit decreases linearly with the logarithm of the frequency in the range 0.15 MHz to 0.50 MHz. 14.2. BLOCK DIAGRAM OF LINE CONDUCTED EMISSION TEST EUT & Support Units Report No.: AGC05177200802FE03 Page 60 of 71 14.3. PRELIMINARY PROCEDURE OF LINE CONDUCTED EMISSION TEST 1. The equipment was set up as per the test configuration to simulate typical actual usage per the user’s manual. When the EUT is a tabletop system, a wooden table with a height of 0.8 meters is used and is placed on the ground plane as per ANSI C63.10 (see Test Facility for the dimensions of the ground plane used). When the EUT is a floor-standing equipment, it is placed on the ground plane which has a 3-12 mm non-conductive covering to insulate the EUT from the ground plane. 2. Support equipment, if needed, was placed as per ANSI C63.10. 3. All I/O cables were positioned to simulate typical actual usage as per ANSI C63.10. 4. All support equipment received AC120V/60Hz power from a LISN, if any. 5. The EUT received DC power from adapter which received AC120V/60Hz power from a LISN. 6. The test program was started. Emissions were measured on each current carrying line of the EUT using a spectrum Analyzer / Receiver connected to the LISN powering the EUT. The LISN has two monitoring points: Line 1 (Hot Side) and Line 2 (Neutral Side). Two scans were taken: one with Line 1 connected to Analyzer / Receiver and Line 2 connected to a 50 ohm load; the second scan had Line 1 connected to a 50 ohm load and Line 2 connected to the Analyzer / Receiver. 7. Analyzer / Receiver scanned from 150 kHz to 30MHz for emissions in each of the test modes. 8. During the above scans, the emissions were maximized by cable manipulation. 9. The test mode(s) were scanned during the preliminary test. Then, the EUT configuration and cable configuration of the above highest emission level were recorded for reference of final testing. 14.4. FINAL PROCEDURE OF LINE CONDUCTED EMISSION TEST 1. EUT and support equipment was set up on the test bench as per step 2 of the preliminary test. 2. A scan was taken on both power lines, Line 1 and Line 2, recording at least the six highest emissions. Emission frequency and amplitude were recorded into a computer in which correction factors were used to calculate the emission level and compare reading to the applicable limit. If EUT emission level was less – 2dB to the A.V. limit in Peak mode, then the emission signal was re-checked using Q.P and Average detector. 3. The test data of the worst case condition(s) was reported on the Summary Data page. 14.5. TEST RESULT OF LINE CONDUCTED EMISSION TEST Note: The EUT is powered by battery. The EUT can not use the BT function with charging. Report No.: AGC05177200802FE03 Page 61 of 71 APPENDIX A: PHOTOGRAPHS OF TEST SETUP RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz Report No.: AGC05177200802FE03 Page 62 of 71 CONDUCTED TEST SETUP Report No.: AGC05177200802FE03 Page 63 of 71 APPENDIX B: PHOTOGRAPHS OF EUT WHOLE VIEW OF EUT TOP VIEW OF EUT Report No.: AGC05177200802FE03 Page 64 of 71 BOTTOM VIEW OF EUT FRONT VIEW OF EUT Report No.: AGC05177200802FE03 Page 65 of 71 BACK VIEW OF EUT LEFT VIEW OF EUT Report No.: AGC05177200802FE03 Page 66 of 71 RIGHT VIEW OF EUT Left OPEN VIEW OF EUT Report No.: AGC05177200802FE03 Page 67 of 71 VIEW OF BATTERY INTERNAL VIEW OF EUT-1 Report No.: AGC05177200802FE03 Page 68 of 71 INTERNAL VIEW OF EUT-2 INTERNAL VIEW OF EUT-3 Antenna Report No.: AGC05177200802FE03 Page 69 of 71 Right OPEN VIEW OF EUT VIEW OF BATTERY Report No.: AGC05177200802FE03 Page 70 of 71 INTERNAL VIEW OF EUT-1 INTERNAL VIEW OF EUT-2 Antenna Report No.: AGC05177200802FE03 Page 71 of 71 INTERNAL VIEW OF EUT-3 ----END OF REPORT---- Conditions of Issuance of Test Reports 1. All samples and goods are accepted by the Attestation of Global Compliance (Shenzhen) Co., Ltd (the “Company”) solely for testing and reporting in accordance with the following terms and conditions. The company provides its services on the basis that such terms and conditions constitute express agreement between the company and any person, firm or company requesting its services (the “Clients”). 2. Any report issued by Company as a result of this application for testing services (the “Report”) shall be issued in confidence to the Clients and the Report will be strictly treated as such by the Company. It may not be reproduced either in its entirety or in part and it may not be used for advertising or ot…

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Test Setup Photos RADIATED EMISSION TEST SETUP BELOW 1GHz RADIATED EMISSION TEST SETUP ABOVE 1GHz CONDUCTED TEST SETUP