Model: bt5.0 audio Bluetooth audio: support Audio external interfacel: Support USB powered: support Sound card function: support Immersion gold craft: Support Battery powered: Support Charge while putting: NO support Key control: NO support Voice calls: NO support Mute control(MUTE): NO support Bluetooth version: Bluetooch V5.0 Decoding format: HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2 AVDTPV1.2 POWER IN: 3.7V-5V DC Signal to noise ratio :90DB Total harmonic distortion: -70dB Crosstalk: -86DB Support configuration file :HFP/A2DP/AVRCP/AVCTPV/AVDTPV/ Transmission distance :15M Decoding format :WAV+APE+FLAC+MP3 Colour: black Material: ABS Size: 44.9x33.75x12.2mm Package Contents: 10 x Audio Receiver (without battery) Only the above package content, other products are not included. Note: Light shooting 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.