Fangrui Product Details Function Description Of Vhm-314 V.20 New Version: Compared With The Old Version, The Size Is The Same, The Bluetooth Indicator Is Blue, And The Power Indicator Is Red. Vhm-314 V.20 Supports Bluetooth 5.0 And Lithium Battery Charging, And Adds Functions Such As Keys, Dial Switches, Diy Mute Interfaces, Etc. Product Name:mp3 Bluetooth Decoder Board Product Number:vhm-314 V.20 Bluetooth Version: 5.0 Usb Powered:universal Micro-usb 5v Power Supply Power Supply:3.7~5v Signal To Noise Ratio:90db +n: -70db Crosstalk:-86db Dnr:91db Support Configuration:a2dp/avctp/avdtp/hfp Service Level: 5 Meters Vhm-314 V.20 Operating Instructions: Key 1: Short Once Is Song, Long Is The Volume Increase (there Be A Drip Sound Prompt At The Maximum Volume) Key 2: Short : Pause/play Key 3: Short Once For The Previous Song, Long To Reduce The Volume Push : Push Up To Supply Power To The Battery Port. When There Is No Battery, Micro-type Supplies Power Indirectly Pull Down Switch: Micro-type Supplies Power Directly. If No Micro-ty