
Text extracted from the exhibit documents filed with the FCC. Open a document above to read the original.
1 ALL RIGHTS RESERVED ©2013. All rights are reserved. No part of this document can be reproduced without permission. All trademarks and brand names mentioned in this publication are property of their respective owners. While all the efforts have been made to ensure the accuracy of contents in this manual, we presume no responsibility for errors or omissions or statements of any kind, whether such errors are omissions or statements resulting from negligence, accidents, or any other cause. We operate a policy of continuous development and reserve the right to make changes, modifications and improvementstothedevice,device features/specifications or any of its parts without prior notice. Your device may have preinstalled bookmarks and links for third party internet sites and may allow you to access third party sites. These are no affiliated with us, and we do not endorse or assume liability for them. If you access such sites, take precautions for security or content. The limited warranty does not cover user manuals or any third party software, settings, content, data or links, whether included/downloaded in the product, whether included during installment, assembly, shipping or any other time in the delivery chain or otherwise and in any way acquired by you. To the extent permitted by applicable law(s), we do not warrant that any our software will meet your requirements, will work in combination with any hardware or software applications 2 provided by a third party, that the operations of the software will be uninterrupted or error free or that any defects in the software are correctable or will be corrected. User’s Manual is provided just to guide the user about the functionality of the device. This does not seem to be any certificate of technology. Some functions may vary due to modifications and up-gradations of software or due to printing mistake. 3 SAFETY PRECAUTIONS Please read the following safety guidelines before using the device. Do not use the phone while you are driving. Do not place magnetic storage media near your phone. Radiation from the phone may erase the information stored on them. Keep your phone and its accessories away from children. Mobile phones can interfere with the functioning of medical devices such as hearing aids or pacemakers. People having active medical implants should keep their cell phone at least 15 cm away from the implant. Permanent hearing loss may occur if you use earphones or headphones at high volume. Use a wireless hands-free system (headphone/ headset) with a low power Bluetooth emitter. Make sure the cell phone has a low SAR. Keep your calls short or send a text message (SMS) instead. This advice applies specially to children adolescents and pregnant women. Use cell phone when the signal quality is good. 4 Notice: ¾ Do not dismantle the device or accessories otherwise, manufacturer is not liable to pay for damages as the device and accessories are not covered by warranty. ¾ Use only original batteries and charging devices. ¾ Please back up your important data timely and keep them properly. The company is not liable for any failure to call or loss of data due to mis-operation, poor signal or power cut, etc. ¾All the screens in this manual are for reference only, and some contents actually displayed may depend upon the presetting of the service provider or the network operator, or the SIM card. If any functions referred to in this manual are different from those of your device, please follow your device. ¾ Do not put use it in a place with flammable gas such as a petrol pumps. The temperature recommended for using the device is 5-35°C.Do not touch the charger, power cable or socket with wet hands. This may cause an electric shock. If your phone or any of its accessories do not function normally, then please visit your nearest authorizedservicefacility.Thequalified personnel will assist you, and if necessary, will arrange for the service. 5 TABLE OF CONTENTS ALL RIGHTS RESERVED...................................1 SAFETY PRECAUTIONS....................................3 1. UNDERSTANDING YOUR DEVICE..................7 2. GETTING STARTED......................................9 3. BASIC OPERATIONS..................................12 3.1 CALLING...................................................12 3.2 MESSAGING..............................................13 3.3 CONTACTS...............................................15 3.4 EMAIL......................................................16 3.5 BROWSER.................................................16 4. HOME SCREEN............................................17 4.1 STATUS BAR.............................................17 4.2 APPLICATION TAB.....................................17 4.3 CUSTOMIZING SCREEN............................18 5. MULTIMEDIA...............................................19 5.1 FILE MANAGER..........................................19 5.2 MUSIC PLAYER..........................................19 5.3 CAMERA...................................................19 5.4 SOUND RECORDER.................................19 5.5 GALLERY..................................................20 5.6 FM RADIO.................................................20 6. NETWORK...................................................21 6.1 WI-FI........................................................21 6.2 3G...........................................................21 6.3 BLUETOOTH.............................................21 7. SETTINGS...................................................23 7.1 SIM MANAGEMENT....................................23 7.2 WIRELESS & NETWOKS..............................23 7.3 AUDIO PROFILES.....................................23 7.4 DISPLAY...................................................23 6 7.5 STORAGE..................................................24 7.6 BATTERY..................................................24 7.7 APPLICATIONS..........................................24 7.8 LO…
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SCS-F18: Project and Product Certification Representative Authorization Letter Page 1 of 2 Rev 3.0 775 Montague Expressway Milpitas, CA 95035 Tel: 408-526-1188 Fax: 408-526-1088 Email: [email protected] Project and Product Certification Representative Authorization Letter Reason for Amendment (current / obsolete) Revision History Approved Date FromTo Initial Release (obsolete)1.01.0Nov-14-2006 Revised wording (obsolete)1.02.0Sept–25-2007 Updated company template (current)2.03.0Jan-31-2012 SCS-F18: Project and Product Certification Representative Authorization Letter Page 2 of 2 Rev 3.0 Verykool USA INC. 2014-1-20 To: SIEMIC, INC. 775 Montague Expressway, Milpitas, CA 95035 USA Dear Sir/Madam, Re: Project and Product Certification Representative Authorization Letter We, Verykool USA INC.hereby authorize SIEMIC, INC. to act as a Certification Body for certifying for the following project(s): Product description : Mobile Phone model name :S450 FCC ID: WA6S450 We affirm that between SIEMIC and Verykool USA INC., any difference in understanding, including test plan, measurement methods, applicable standards and relevant procedures and processes have beenresolved prior to commencement of testing activities. Sincerely, Client’s signature : Client’s name / title:Sunny Choi /Manager Contact information / address:3636 Nobel Drive, Suite 325, San Diego, CA 92122
SCS-F19: Confidentiality Request LetterPage 1 of 2 Rev 3.0 775 Montague Expressway Milpitas, CA 95035 Tel: 408-526-1188 Fax: 408-526-1088 Email: [email protected] Confidentiality Request Letter Reason for Amendment (current / obsolete) Revision History Approved Date FromTo Initial Release (obsolete)1.01.0Nov-14-2006 Adding CFR 2.459 (obsolete)1.02.0August – 11 - 2008 Updated company template & Added text box (current) 2.03.0Jan-31-2012 SCS-F19: Confidentiality Request LetterPage 2 of 2 Rev 3.0 Verykool USA INC. (2014-1-20) To: Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD Subject:Permanent Confidentiality Requestfor FCC ID:WA6S450 We hereby request confidential treatment of information accompanying this application as outlined below: -BlockDiagram -Schematics -Operational Description -BOM - Tune up The above materials contain trade secrets and proprietary information not customarily released to the public. The public disclosure of these materials may be harmful to the applicant and provide unjustified benefits to its competitors. The applicant understands that pursuant to Section 0.457 & 0.459 of the Rules, disclosure of this application and all accompanying documentation will not be made before the date of the Grant for this application. Sincerely, Client’s signature : Client’s name / title : Sunny Choi/ Manager Contact information / address:3636 Nobel Drive, Suite 325, San Diego, CA 92122
Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 19 of 34 www.siemic.com.cn Annex B. EUT AND TEST SETUP PHOTOGRAPHS Annex B.i. Photograph 1: EUT External Photo Whole Package - Top View Adapter – Top View Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 20 of 34 www.siemic.com.cn UT - Front View EUT - Rear View Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 21 of 34 www.siemic.com.cn EUT - Top View EUT - Bottom View Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 22 of 34 www.siemic.com.cn EUT - Left View EUT - Right View
Label Location
Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 23 of 34 www.siemic.com.cn Annex B.ii. Photograph 2: EUT Internal Photo Cover Off - Top View 1 Cover Off - Top View 2 Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 24 of 34 www.siemic.com.cn Battery - Top View Battery - Bottom View Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 25 of 34 www.siemic.com.cn Mainborad With Shielding - Front View Mainborad Without Shielding - Front View Title: EMC Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15 Subpart B Class B: 2013 , ANSI C63.4:2009 Report No.: 13070615-FCC-E1 Issue Date: January 17, 2014 Page: 26 of 34 www.siemic.com.cn Mainborad – Rear View Antenna View GSM/ UMTS Antenna Bluetooth/WIFI /BLE Antenna
Verykool USA INC. Mobile Phone Main Model: S450 Serial Model: N/A January 17, 2014 Report No.: 13070615-FCC-R3 (This report supersedes none) Modifications made to the product : None This Test Report is Issued Under the Authority of: Fly Xu Compliance Engineer Alex Liu Technical Manager This test report may be reproduced in full only. Test result presented in this test report is applicable to the representative sample only. Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 2 of 72 www.siemic.com.cn Laboratory Introduction SIEMIC, headquartered in the heart of Silicon Valley, with superior facilities in US and Asia, is one of the leading independent testing and certification facilities providing customers with one-stop shop services for Compliance Testing and Global Certifications. In addition to testing and certification, SIEMIC provides initial design reviews and compliance management through out a project. Our extensive experience with China, Asia Pacific, North America, European, and international compliance requirements, assures the fastest, most cost effective way to attain regulatory compliance for the global markets . SIEMIC (Shenzhen - China) Laboratories Accreditations for Conformity Assessment Country/Region Scope USA EMC , RF/Wireless , Telecom Canada EMC, RF/Wireless , Telecom Taiwan EMC, RF, Telecom , Safety Hong Kong RF/Wireless ,Telecom Australia EMC, RF, Telecom , Safety Korea EMI, EMS, RF , Telecom, Safety Japan EMI, RF/Wireless, Telecom Singapore EMC , RF , Telecom Europe EMC, RF, Telecom , Safety Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 3 of 72 www.siemic.com.cn This page has been left blank intentionally. Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 4 of 72 www.siemic.com.cn CONTENTS 1 EXECUTIVE SUMMARY & EUT INFORMATION .......................................................................................... 5 2 TECHNICAL DETAILS ......................................................................................................................................... 6 3 MODIFICATION ..................................................................................................................................................... 7 4 TEST SUMMARY .................................................................................................................................................... 8 5 MEASUREMENTS, EXAMINATION AND DERIVED RESULTS .................................................................. 9 ANNEX A. TEST INSTRUMENT & METHOD ........................................................................................................ 52 ANNEX B. EUT AND TEST SETUP PHOTOGRAPHS ........................................................................................... 57 ANNEX C. TEST SETUP AND SUPPORTING EQUIPMENT ................................................................................ 67 ANNEX D. USER MANUAL / BLOCK DIAGRAM / SCHEMATICS / PART LIST ............................................. 71 ANNEX E. DECLARATION OF SIMILARITY ........................................................................................................ 72 Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 5 of 72 www.siemic.com.cn 1 EXECUTIVE SUMMARY & EUT INFORMATION The purpose of this test programme was to demonstrate compliance of the Verykool USA INC., Mobile Phone and model: S450 against the current Stipulated Standards. The Mobile Phone has demonstrated compliance with the FCC Part 15.247: 2013, ANSI C63.4: 2009. EUT Information EUT Description : Mobile Phone Main Model : S450 Serial Model : N/A Antenna Gain : UMTS-FDD Band V/GSM850: -1.25 dBi UMTS-FDD Band II/PCS1900: -0.73 dBi Bluetooth/WIFI: -1.1 dBi BLE: -1.1 dBi Input Power : Battery: Model: KLB175N267 Spec: 3.7V 1750mAh 6.475Wh Limited charger voltage: 4.2V Adapter: Model: SKL-5WU-U050-1000 Input: 100-240V; 50/60Hz 0.15A Output: 5.0V; 1000mA Classification Per Stipulated Test Standard : FCC Part 15.247: 2013, ANSI C63.4: 2009 Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 6 of 72 www.siemic.com.cn 2 TECHNICAL DETAILS Purpose Compliance testing of Mobile Phone with stipulated standard Applicant / Client Verykool USA INC. 3636 Nobel Drive, Suite 325, San Diego, CA 92122 Manufacturer ShenZhen Konka Telecommunication Technology Co., ltd Overseas Chinese Town nanshan district, Shenzhen, China Laboratory performing the tests SIEMIC Shenzhen (Shenzhen - China) Laboratories Zone A, Floor 1, Building 2, Wan Ye Long Technology Park, South Side of Zhoushi Road, Bao'an District, Shenzhen, Guangdong, China Tel: +86-0755-2601 4629 / 2601 4953 Fax: +86-0755-2601 4953-810 Email:[email protected] Test report reference number 13070615-FCC-R3 Date EUT received January 09, 2014 Standard applied FCC Part 15.247: 2013, ANSI C63.4: 2009 Dates of test (from – to) January 09 to January 15, 2014 No of Units : #1 Equipment Category : Spread Spectrum System/Device Trade Name : Verykool RF Operating Frequency (ies) GSM850 TX : 824.2 ~ 848.8 MHz; RX : 869.2 ~ 893.8 MHz PCS1900 TX : 1850.2 ~ 1909.8 MHz; RX : 1930.2 ~ 1989.8 MHz UMTS-FDD BandVTX : 826.4 ~ 846.6 MHz; RX : 871.4 ~ 891.6 MHz UMTS-FDD BandIITX :1852.4 ~ 1907.6 MHz; RX : 1932.4 ~ 1987.6 MHz 802.11b/g/n: 2412-2462 MHz Bluetooth& BLE: 2402-2480 MHz Number of Channels 299CH (PCS1900) and 124CH (GSM850) UMTS-FDD BandV: 1…
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Verykool USA INC. Mobile Phone Main Model: S450 Serial Model: N/A January 17, 2014 Report No.: 13070615-FCC-R4 (This report supersedes none) Modifications made to the product : None This Test Report is Issued Under the Authority of: Fly Xu Compliance Engineer Alex Liu Technical Manager This test report may be reproduced in full only. Test result presented in this test report is applicable to the representative sample only. Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 2 of 49 www.siemic.com.cn Laboratory Introduction SIEMIC, headquartered in the heart of Silicon Valley, with superior facilities in US and Asia, is one of the leading independent testing and certification facilities providing customers with one-stop shop services for Compliance Testing and Global Certifications. In addition to testing and certification, SIEMIC provides initial design reviews and compliance management through out a project. Our extensive experience with China, Asia Pacific, North America, European, and international compliance requirements, assures the fastest, most cost effective way to attain regulatory compliance for the global markets . SIEMIC (Shenzhen - China) Laboratories Accreditations for Conformity Assessment Country/Region Scope USA EMC , RF/Wireless , Telecom Canada EMC, RF/Wireless , Telecom Taiwan EMC, RF, Telecom , Safety Hong Kong RF/Wireless ,Telecom Australia EMC, RF, Telecom , Safety Korea EMI, EMS, RF , Telecom, Safety Japan EMI, RF/Wireless, Telecom Singapore EMC , RF , Telecom Europe EMC, RF, Telecom , Safety Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 3 of 49 www.siemic.com.cn This page has been left blank intentionally. Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 4 of 49 www.siemic.com.cn CONTENTS 1 EXECUTIVE SUMMARY & EUT INFORMATION .......................................................................................... 5 2 TECHNICAL DETAILS ......................................................................................................................................... 6 3 MODIFICATION ..................................................................................................................................................... 7 4 TEST SUMMARY .................................................................................................................................................... 8 5 MEASUREMENTS, EXAMINATION AND DERIVED RESULTS .................................................................. 9 ANNEX A. TEST INSTRUMENT & METHOD ........................................................................................................ 29 ANNEX B. EUT AND TEST SETUP PHOTOGRAPHS ........................................................................................... 34 ANNEX C. TEST SETUP AND SUPPORTING EQUIPMENT ................................................................................ 44 ANNEX D. USER MANUAL / BLOCK DIAGRAM / SCHEMATICS / PART LIST ............................................. 48 ANNEX E. DECLARATION OF SI ............................................................................................................................. 49 Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 5 of 49 www.siemic.com.cn 1 Executive Summary & EUT information The purpose of this test programme was to demonstrate compliance of the Verykool USA INC., Mobile Phone and model: S450 against the current Stipulated Standards. The Mobile Phone has demonstrated compliance with the FCC Part 15.247: 2013, ANSI C63.4: 2009. EUT Information EUT Description : Mobile Phone Main Model : S450 Serial Model : N/A Antenna Gain : UMTS-FDD Band V/GSM850: -1.25 dBi UMTS-FDD Band II/PCS1900: -0.73 dBi Bluetooth/WIFI: -1.1 dBi BLE: -1.1 dBi Input Power : Battery: Model: KLB175N267 Spec: 3.7V 1750mAh 6.475Wh Limited charger voltage: 4.2V Adapter: Model: SKL-5WU-U050-1000 Input: 100-240V; 50/60Hz 0.15A Output: 5.0V; 1000mA Classification Per Stipulated Test Standard : FCC Part 15.247: 2013, ANSI C63.4: 2009 Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 6 of 49 www.siemic.com.cn 2 TECHNICAL DETAILS Purpose Compliance testing of Mobile Phone with stipulated standard Applicant / Client Verykool USA INC. 3636 Nobel Drive, Suite 325, San Diego, CA 92122 Manufacturer ShenZhen Konka Telecommunication Technology Co., ltd Overseas Chinese Town nanshan district, Shenzhen, China Laboratory performing the tests SIEMIC (Shenzhen - China) Laboratories Zone A, Floor 1, Building 2, Wan Ye Long Technology Park, South Side of Zhoushi Road, Bao'an District, Shenzhen, Guangdong, China Tel: +86-0755-2601 4629 / 2601 4953 Fax: +86-0755-2601 4953-810 Email: [email protected] Test report reference number 13070615-FCC-R4 Date EUT received January 09, 2014 Standard applied FCC Part 15.247: 2013, ANSI C63.4: 2009 Dates of test (from – to) January 09 to January 15, 2014 No of Units : #1 Equipment Category : Spread Spectrum System/Device Trade Name : Verykool RF Operating Frequency (ies) GSM850 TX : 824.2 ~ 848.8 MHz; RX : 869.2 ~ 893.8 MHz PCS1900 TX : 1850.2 ~ 1909.8 MHz; RX : 1930.2 ~ 1989.8 MHz UMTS-FDD BandVTX : 826.4 ~ 846.6 MHz; RX : 871.4 ~ 891.6 MHz UMTS-FDD BandIITX :1852.4 ~ 1907.6 MHz; RX : 1932.4 ~ 1987.6 MHz 802.11b/g/n: 2412-2462 MHz Bluetooth& BLE: 2402-2480 MHz Number of Channels 299CH (PCS1900) and 124CH (GSM850) UMTS-FDD Ban…
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Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 65 of 72 www.siemic.com.cn Annex B.iii. Photograph 3: Test Setup Photo Conducted Emissions Test Setup Front View Conducted Emissions Test Setup Side View Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R3 Issue Date: January 17, 2014 Page: 66 of 72 www.siemic.com.cn Radiated Spurious Emissions Test Setup Below 1GHz - Front View Radiated Spurious Emissions Test Setup Above 1GHz –Front View
Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 42 of 49 www.siemic.com.cn Annex B.iii. Photograph 3: Test Setup Photo Conducted Emissions Test Setup Front View Conducted Emissions Test Setup Side View Title: RF Test Report for Mobile Phone Main Model: S450 Serial Model: N/A To: FCC Part 15.247: 2013, ANSI C63.4: 2009 Report No.: 13070615-FCC-R4 Issue Date: January 17, 2014 Page: 43 of 49 www.siemic.com.cn Radiated Spurious Emissions Test Setup Below 1GHz - Front View Radiated Spurious Emissions Test Setup Above 1GHz –Front View
| # | Rule Parts | Frequency Range | Power Output |
|---|---|---|---|
| 2 | 15C | 2.40 GHz - 2.48 GHz | 678.00 µW |

Mobile Phone
Equipment Class
DTS - Digital Transmission System
Mobile Phone
Equipment Class
DTS - Digital Transmission System
Mobile Phone
Equipment Class
DTS - Digital Transmission System
Mobile Phone
Equipment Class
DTS - Digital Transmission System
Mobile Phone
Equipment Class
DTS - Digital Transmission System