ITEM NAME:Bluetooth 4.1Decoder Modified Circuit Stereo DIY Board Micro USB3.7-5V BatteryBX Feature: Universal Micro USB 5V power supply External 3.7-5v lithium battery power supply conversion Keep blue light on bluetooth mode Standard 3.5mm interface, output stereo audio source, can plug in the headset, connected amplifier and other equipment Specification: Power Supply:3.7-5V SNR:90dB THD+N:-70dB Crosstalk:-86dB DNR:91dB Support Profile:A2DP/AVCTP/AVDTP/AVRCP/HFP LOS:>15m Package Included: 1 x Bluetooth Decoder.Keep blue light on bluetooth mode. 1 x Bluetooth Decoder.