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Colour: BlackSize: 30 * 30mmPower supply: 3.7-5Signal to noise ratio: 90DBTotal harmonic distortion + noise: -70DBCrosstalk: -86DBSupport profile: ADP / AVCTP / AVDTP / AVRCP / HFPTransmission distance: 15m (under barrier-free environment)Decoding format: WAV+APE+FLAC+MP3 lossless decoding, stereo outputFeatures:Charge and Discharge: This product has the function of charging and discharging, and can be powered by USB power. Note: If the USB is suddenly disconnected during charging and playback, Blue tooth will automatically restart, automatically connect and maintain the previous playback state.LED Indicator: When the power is supplied by a single USB, the red light flashes, indicating that the power supply is normal; when the power is supplied by a single battery, the yellow light is always on, indicating that the battery is supplying normally; A flashing light indicates that it is charging, and a steady red light indicates that the battery is fully charged. Incoming Call Voice Call Function: After Blue tooth is connected, turn on the call audio mode in the Bluetooth settings. If the phone comes in, you can answer/hang up through the PLAY/STOP button.When the computer sound card is used: tin the pads in the two boxes corresponding to the Sound Card on the back of the module, and connect it to the computer USB port through the USB cable at this time, and it can be used as a sound card. The sound played by this computer is output through the audio interface of the module.Package Including1 * MP3 Audio blue tooth 5.0 receiver board