SLFEF-W280Powered Bookshelf Bluetooth and Wifi Speakers

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. Caution: Any changes or modifications to this device not explicitly approved by manufacturer could void your authority to operate this equipment. 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. The device has been evaluated to meet general RF exposure requirement. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.

4/23/2021 Equipment Autorisation Division Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 FCC ID: SLFEF-W280 Product Name: Powered Bookshelf Bluetooth and Wifi Speakers Request for Confidentiality Pursuant to Sections 0.457 and 0.459 of the commissions rules, we hereby request that the following documents be held confidential:  Schematics Long-term confidential  Block diagram Long-term confidential  Operation description Long-term confidential These materials contain trade secrets and proprietary information and are not customarily released to the public. The public disclosure of this information might be harmful to the company and provide unjustified benefits to our competitors. Signature: Name huafeng Huang Position Engineer Company Name Shenzhen Wanfengda Electronics Co., Ltd Address 2F, Building 1, Hezhou Yuye Industrial Zone, Xixiang, Bao’an, Shenzhen, Guangdong, China, 518128. Tel +86-755-29617689 Fax / Email [email protected]

FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280

4.5cm 2.5cm 4.5cm Label Location FCC ID: SLFEF-W280 Shenzhen Wanfengda Electronics Co., Ltd Product name: Powered Bookshelf Bluetooth and Wifi Speakers Model No.: EF-W280 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.

FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 BT ANT WIFI ANT FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 FCC ID: SLFEF-W280

FCC ID: SLFEF-W280 MPE Calculation Method Predication of MPE limit at a given distance Equation from page 19 of OET Bulletin 65, Edition 97-01 퐒= 푬푰푹푷 ퟒ흅푹 ퟐ where: S = power density (in appropriate units, e.g. mW/cm 2 ) EIRP = equivalent (or effective) isotropically radiated power (in appropriate units, e.g., mW) R = distance to the center of radiation of the antenna (appropriate units, e.g., cm) As declared by the Applicant, the EUT is a wireless device used in a fix application, at least 20 cm from any body part of the user or nearby persons; from the maximum EUT RF output power, the minimum separation distance, r =20cm, as well as the gain of the used antenna is 2dBi, the RF power density can be obtained. So, the worst result is below: Bluetooth: Max Output Power = 0.097 dBm, Ant gain 2dBi EIRP=PG= (0.097+2.0) dBm=2.097 dBm=10 (2.097/10) mW=1.62mW So, 퐒= 푬푰푹푷 ퟒ흅푹 ퟐ = ퟏ.ퟔퟐ ퟒ흅×ퟐퟎ ퟐ =0.0003mW/cm 2 <1.0 mW/cm 2 Wi-Fi: Max Output Power = 9.767 dBm, Ant gain 2dBi EIRP=PG= (9.767+2.0) dBm=11.767 dBm=10 (11.767/10) mW=15.02mW So, 퐒= 푬푰푹푷 ퟒ흅푹 ퟐ = ퟏퟓ.ퟎퟐ ퟒ흅×ퟐퟎ ퟐ =0.0030mW/cm 2 <1.0 mW/cm 2 Bluetooth and Wi-Fi can transmit at the same time, so, S=(0.0003+0.0030) mW/cm 2 =0.0033 mW/cm 2 <1.0 mW/cm 2 Conclusion: Pass.

FCC TEST REPORT FCC ID: SLFEF-W280 On Behalf of Shenzhen Wanfengda Electronics Co., Ltd Powered Bookshelf Bluetooth and Wifi Speakers Model No.: EF-W280 Prepared for : Shenzhen Wanfengda Electronics Co., Ltd Address : 2F, Building 1, Hezhou Yuye Industrial Zone, Xixiang, Bao’an, Shenzhen, Guangdong, China, 518128. Prepared By : Shenzhen Alpha Product Testing Co., Ltd. Address : Building i, No.2, Lixin Road, Fuyong Street, Bao’an District, 518103, Shenzhen, Guangdong, China Report Number : A2103115-C01-R04 Date of Receipt : March 17, 2021 Date of Test : March 17, 2021-April 16, 2021 Date of Report : April 23, 2021 Version Number : V0 Page 2 of 78 Report No.: A2103115-C01-R04 TABLE OF CONTENTS Description Page 1. Summary Of Standards And Results ................................................................................................... 6 1.1. Description of Standards and Results .......................................................................... 6 2. General Information .............................................................................................................................. 7 2.1. Description of Device (EUT) ....................................................................................... 7 2.2. Accessories of Device (EUT) ...................................................................................... 8 2.3. Tested Supporting System Details ............................................................................... 8 2.4. Block Diagram of connection between EUT and simulators ...................................... 8 2.5. Test Mode Description ................................................................................................. 8 2.6. Test Conditions ............................................................................................................ 8 2.7. Test Facility ................................................................................................................. 9 2.8. Measurement Uncertainty ............................................................................................ 9 2.9. Test Equipment List ................................................................................................... 10 3. Maximum Peak Output Power ........................................................................................................... 11 3.1. Limit .......................................................................................................................... 11 3.2. Test Procedure ........................................................................................................... 11 3.3. Test Setup ................................................................................................................... 11 3.4. Test Result ................................................................................................................. 11 4. Bandwidth ............................................................................................................................................. 12 4.1. Limit .......................................................................................................................... 12 4.2. Test Procedure ........................................................................................................... 12 4.3. Test Result ................................................................................................................. 12 5. Carrier Frequency Separation ............................................................................................................ 22 5.1. Limit .......................................................................................................................... 22 5.2. Test Procedure ........................................................................................................... 22 5.3. Test Result ................................................................................................................. 22 6. Number Of Hopping Channel ............................................................................................................. 24 6.1. Limit .......................................................................................................................... 24 6.2. Test Procedure ........................................................................................................... 24 6.3. Test Result ................................................................................................................. 24 7. Dwell Time ............................................................................................................................................ 26 7.1. Test limit .................................................................................................................... 26 7.2. Test Procedure ........................................................................................................... 26 7.3. Test Result ................................................................................................................. 26 8. Radiated Emissions .............................................................................................................................. 32 8.1. Limit .......................................................................................................................... 32 8.2. Block Diagram of Test setup ..................................................................................... 33 8.3. Test Procedure ........................................................................................................... 34 8.4. Test Result ................................................................................................................. 34 9. Band Edge Compliance ....................................................................................................................... 40 Page 3 of 78 Report No.: A2103115-C01-R04 9.1. Block…

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FCC ID: SLFEF-W280 Photos of Radiated emission FCC ID: SLFEF-W280 FCC ID: SLFEF-W280 Photos of Conducted Emission test