Model Number: MP3 Bluetooth Decoder Board Lossless Power Supply: 3.7-5V : 90dB + N: -70dB Crosstalk: -86dB DNR: 91dB Support: A2DP / AVCTP / AVDTP / AVRCP / HFP LOS: more than 15m USB Powered Universal - USB 5V power supply 3.7-5V Power Supply Board External 3.7-5V lithium battery power conversion LED Indicator Bluetooth mode long blue light 3.5mm Stereo Audio Interface Standard 3.5mm interface, output stereo, connect headphones, connect amplifier and other devices. After the power is turned on, the blue indicator lights up and enters Bluetooth mode; the English "The bluetooth device is to pair" is displayed, indicating that Bluetooth mode has been activated and is ready for pairing; the "XY_BT" searched by the mobile phone's Bluetooth is the decoder board's device name. , Click to connect, the decoder board prompts "The bluetooth device is connected successfully", indicating that the decoder board and the mobile phone are connected successfully, you can . As shown in the picture; Color: Red Material: PC + Metal Package Contents: 1* MP3 Bluetooth Decoder Module Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm.