Power supply: 3.7-5V Signal to noise ratio: 90DB Total harmonic distortion + noise: -70dB Crosstalk: -86DB Support profile: A2DP/AVCTP/AVDTP/AVRCP/HFP Transmission distance: 15M (open without partition wall) Decoding format: WAV+APE+FLAC+MP3 lossless decoding, stereo output Bluetooth audio: support Audio external interface: support USB power supply: support Sound card function: support Battery powered: support Model: BT5.0 Audio colour: black Material: ABS size: 3.3cm Package Contents: 2 x Bluetooth Audio Decoder Board Only the above package content, other products are not included. Note: Light reflection 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.