Transmit the received + signal to the car audio AUX IN connector via LIEN OUT or FM. No need to install, no need to install the application, just trun on the product, connect through 3.5 AUX. operation, free switch The appearance is small and exquisite, easy to carry. When you have an old radio with AUX installed in the interface and power pack, you can use this outdoor receiver to listen to the signal radio. Working voltage limit:5V USB input: 5V/1A Working temperature: Less than 60 Modulation mode: QPSK Frequency: 177 MHz-240 MHz Non-channel memory: support Product features: 1. / + receiver 2. One-touch search on receiver, remote control of power amplifier host or button to control + play program and change channel 3. The buttons have indicator lights, and the red and green lights are cool: A. The green light is always on, and the program is playing normally B. The green light flashes, and the signal is weak C. The red light is always on, and there is no signal D. The red and green lights flash alternately, searching for programs Box only for MP3 player with USB ports Please confirm your country/area has good + signal before purchase. Not suitable for Android car radios Features: Band receiver USB interface Support MP3 system -band channel search LED light signal status indication Full Band Search NOTE:Short SEARCH button to search the station Color:Black Material:plastic Package Contents: 1 * Car + Digital Radio Box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.