Power supply: 3.7-5VSignal to noise : 90DB harmonic distortion + noise: -70dBCrosstalk: -86DBSupport : A2DP/AVCTP/AVDTP/AVRCP/HFPTransmission distance: 15M (open without partition wall)Decoding : WAV++FLAC+MP3 lossless decoding, stereo outputBluetooth audio: supportAudio external interface: supportUSB power supply: supportSound card function: supportBattery powered: supportModel: BT5.0 AudioGold sinking process: supportFill while playing: supportKey control: supportVoice call: supportMute control (MUTE): supportDifferent batches may have differences in product appearance and color, which will not affect the useColor: blackMaterial: PCBPackage Contents:1 x Bluetooth Audio Decoder BoardOnly 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.