Supply 3.7-5VSNR 90dB+N -70dBCrosstalk -86dBDNR 91dBSupport Profile A2DP/AVCTP/AVDTP/AVRCP/HFPLOS Greater than 15mUSB powered Universal -USB 5V supply 3.7-5V Supply Pad External 3.7-5V lithium battery conversion LED indicator Bluetooth mode long blue light 3.5mm stereo audio interface Standard 3.5mm interface, output stereo sound source, plug in headphones, connect amplifiers and other devicesInstructions:After the is turned on, the blue indicator lights up and enters the Bluetooth mode; the English "The bluetooth device is to pair" is displayed, indicating the Bluetooth mode is entered and waiting for pairing; the "XY_BT" searched by the mobile phone Bluetooth is the device name of the decoding board. , Click on the connection, the decoder board prompts "The bluetooth device is connected successfully", indicating the decoder board and the mobile phone are connected successfully, you can play music. As shown belowColour:blackMaterial:plasticDifferent batches from the factory, slight changes in appearance have no effectPackage Contents:10 x Bluetooth Audio ReceiverOnly 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.