Decoding Format: WAV+APE+FLAC+MP3 lossless decoding, stereo output BT5.0-Audio: 5.0 Blue tooth audio decoding chip. Supports incoming voice calls and can be used as a computer sound card Transmission Distance: 15m transmission under barrier-free environment Application: With the basic functions of B T5.0 Audio, long-distance transmission, lossless sound quality, Blue tooth 5.0 is backward compatible with Blue tooth 4.2, 4.1, 4.0 Choose between USB power supply and battery power supply: This product has a discharge function and can be powered by a USB power supply. Note: If the USB is suddenly disconnected during playback, Blue tooth will automatically restart, automatically connect and maintain the previous playback state (Note: The product cannot be ) Different factory batches may have slight differences in appearance, which will not affect the use Colour:Black Material:ABS Package Contents: 5 x Bluetooth Audio Receiver 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.