Features: 1.Through the Bluetooth device function, allows you to connect to external audio sources. Fit for E46 / E39 / E53 / X5. 2.Can support general MP3 format audio, and also support WMA, WAV, FLAC and other high?quality audio format decoding 3.Using Bluetooth 5.0 protocol, backward compatible with 2.0, 3.0, 4.0, 5.0 other versions of Bluetooth protocol. 4.Non?universal ordinary Bluetooth function, can support DSD large?capacity transmission, stable data transmission between devices, high fidelity, designed for music enthusiasts. 5.With the advancement of wireless technology and subsequent wireless transmission becoming the trend of the times, this is a wireless Bluetooth music product suitable for automotive use. Specification: Item Type: AUX Port Bluetooth Module Adapter Material: ABS Fitment: Fit for (E46): 320i, 320ci, 320cic, 323i, 323ci, 323cic, 325i, 325ci, 325cic, 328i, 328ci, 328cic, 330i, 330ci, 330cic & M3 (Coupe, Sedan & Convertible) 09/2002+ 2002 - 2006 Fit for (E39): 525i, 525iT, 530i, 530iT, 540i, 540iT & M5 (Sedan) 09/2002+ 2002 - 2003 Fit for (E53): X5 3.0, 4.4, 4.6, 4.8 and X5 M 10/2002+ Wiring Instructions: Red wire to positive Black wire to negative Insert the CD player jack (please confirm the corresponding socket), connect the mobile phone to the Bluetooth module, and select the AUX audio source to play mobile music. Interface: 3Pin to Bluetooth module