ITEM NAME:Mini Bluetooth 5.0 MP3 Decoder Board Audio Receiver MP3 Lossless Player ModS Ew Characteristic: 100 brand new Multi function and buttons: With microphone, with switch (can be opened or closed), with multi-function button Can be charged, while charging and discharging, full automatic stop Description: 1.Parameter characteristics Power Supply 3.7-5V SNR 90dB THD+N -70dB Crosstalk -86dB DNR 91dB Support Profile A2DP/AVCTP/AVDTP/AVRCP/HFP LOS >15m 2.Interface details USB.As shown below. 1 5.0 Bluetooth audio board (upgrade version). 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 devices.