Features:1. Using Bluetooth 5.0 chip,2. Support Bluetooth reception (RX), Bluetooth transmission (TX), FM transmission, TF card playback, 4-in-1 function,3. TF card playback is available in receiving, transmitting and FM modes, and supports mp3/flac/wav/wam/ape and other formats,4. Built-in 300 mAh polymer battery, which can continuously listen to music for about 6 hours,5. Multi-function button, supports power on/off/play/pause/up and down song/volume increase and decrease/audio source switching/frequency adjustment,6. High-definition LED digital display, various working statuses are clear at a glance,7. Cars without AUX interface also support FM transmitter connection, and the frequency can be adjusted from FM 87.5~108MHZ. It is universal and the signal is stable and noise-free,8. Bluetooth transmission distance is 10 meters,9. Built-in high-quality decoding chip, high-definition stereo sound quality (supports sound quality comparison of similar products, no reason to return if not satisfied),10. Product color: black, net weight: 21g, size: 66*43*12mm (bare metal),packing list: 1×Digital Bluetooth Adapter