Specifications: BT5.0 Power Supply:3.7-5V:90dB; +N:-70dB; Crosstalk:-86dB; DNR:91dBSupport :A2DP/AVCTP/AVDTP/AVRCP/HFP: 15m; Plate size: 38 x 36mm; Shell size: 42.85 x 39.8 x 16.76mmInterface details:USB powered Universal -USB 5V power supply3.7-5V Supply Pad External 3.7-5V lithium battery power conversionLED indicator Bluetooth mode long blue light3.5mm stereo audio interface Standard 3.5mm interface, output stereo , plug in headphones, connect amplifiers and other devicesInstructions:After the power is turned on, the blue indicator lights up and enters the Bluetooth mode; the English "The bluetooth device is to pair" is displayed, indicating that the Bluetooth mode is entered and for pairing; the "VHM-314" 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 that the decoder board and the mobile phone are connected successfully, you can .color:BlackMaterial:ABSPackage Contents:1 x MP3 Bluetooth 5.0 decoder board(Without battery)1 x caseOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.