1Made of high quality ABS material, durabel and plug and play. Fit for Citroen and for Peugeot, to better meet your needs. 2You can hear music from your phone/ pad/ mp3 (They should have bluetooth function). You can also use it to answer calls with clear sound quality. 3Match your phone or pad to bluetooth module. And choose AUX from your radio, then you can use your phone to play music through car speakers. 4Adopt Bluetooth 5.0 protocol, backward compatible with 2.0, 3.0, 4.0 and other versions of Bluetooth protocol. 5Support common MP3 format audio, also support for WMA, for WAV, for FLAC, and other highquality audio format decoding. 6Nongeneral ordinary bluetooth function, supports DSD Largecapacity transmission and stable data transfer between devices.