FCC ID: X3QJUMPSP01 JUMP + Powerbank

NATIVE UNION 2/F East Town Building 41 Lockhart Road Wan Chai, Hong Kong T +852 2522 0880 F +852 2522 0803 nativeunion.com LETTER OF AGENCY

[21 Oct 2019]

"I, an officer of Design Pool Limited do hereby authorize Intertek Testing Services (Mr. Terry Chan / Koo Wai Ip / Kenneth Wong) to act on our behalf in front of the Federal Communications Commission with respect to all matters relating to certification of equipment under Part 15 and Part 18 of the FCC Rules until further notice."

I further certify that no party (as defined in 1.2002(b) of CFR 47, 2004) to this application, including myself, is subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C.,862. Dated this 21% day of Oct 2019 By eee Printed Name/Title: Igor Duc/ Co-Founder CEO Phone: +852 2522 0880 Email: igorduc@nativeunion.com Signature:-

FCC ID: X3QJUMPSP01 Technical Description:

The following requirements have been met according to clause 5b of 680106 D01 RF Exposure Wireless Charging App v03.

(1) Power transfer frequency is less than 1 MHz. Ans: the operating frequency is 117kHz 166kHz

(2) Output power from each primary coil is less than or equal to 15 watts. Ans: The WPT is less than 15watts.

(3) The transfer system includes only single primary and secondary coils. This includes charging systems that may have multiple primary coils and clients that are able to detect and allow coupling only between individual pairs of coils. Ans: It is a single coil only.

(4) Client device is placed directly in contact with the transmitter. Ans: Yes.

(5) Mobile exposure conditions only (portable exposure conditions are not covered by this exclusion). Ans: It is also for portable use, it can be referred from FCC KDB 680106 D01

(6) The aggregate H-field strengths at 15 cm surrounding the device and 20 cm above the top surface from all simultaneous transmitting coils are demonstrated to be less than 50% of the MPE limit. Ans: the result can be found on RF exposure report. Circuitry Description The product is a wireless charging transmitter meeting the WPC Qi standard and can supply all the wireless charging receiver which also meeting the Qi standard. Wireless charging system use magnetic induction wireless charging technology, energy transmission is realized by using series resonance method. The main control chip IC CWT1000, it works with inverter circuit, TX coil L, resonant circuit, capacitance c and other components combined as wireless charging transmitter. TX input side input DC voltage(5v), the DC voltage pass through power full bridge Q1,Q2 and produces an AC voltage, give the TX coil AC electrical signal, AC electrical signals change to changing magnetic field, the Ac electrical signal work frequency is 117-166KHz. The changing magnetic field pass through the Rx coil, the receiving coil will generate an electric filed. And the system communicates through demodulation the AM signal which coupled to the transmitting coil from RX coil, and Tx system controls the energy transmission through the adjustment of frequency, phase and duty cycle.