USB powered Universal -USB 5V supply3.7-5V Supply Pad External 3.7-5V lithium battery conversionLED indicator Bluetooth mode long blue light3.5mm stereo audio interface Standard 3.5mm interface, output stereo , plug in headphones, amplifiers and other devices Supply 3.7-5V 90dB+N -70dBCrosstalk -86dBDNR 91dBSupport Profile A2DP/AVCTP/AVDTP/AVRCP/HFPAfter 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. Different batches from the factory may have different appearance and printing, which does not affect the of the productColour:redMaterial:plasticPackage Contents:2 x Bluetooth Audio Receiver BoardOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.