ITEM NAME:VHM-314 bluetooth audio receiver board bluetooth 4.1mp3 lossless decoder boardBX 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 Interface details: USB.1X 3.7-5V Mini Bluetooth MP3 Decoder Board Power amplifier Board Bluetooth 4.1. 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.