2 pcs BT5.0 Audio Receiver: 1 pcs A & 1 pcs B Support configuration file:HFP/A2DP/AVRCP/AVCTPV/AVDTPV Decoding format: HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2 AVDTPV1.2 POWER IN: 3.7V-5V DC Signal to noise ratio:90DB Colour:black Material:ABS Total harmonic distortion: -70dB Crosstalk: -86DB Transmission distance:15M Decoding format:WAV+APE+FLAC+MP3 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 Size: 44.9x33.75x12.2mm & 42.85x39.8x16.76mm Package Contents: 2 * 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.