Bluetooth 4.1 Amplifier Module, Mini MP3 Lossless Decoder Board Car Speaker Amplifier Board WAV+APE+FLAC+MP3

right so product review come again this is an audio player module from my station calm it has USB and compact flash support there it also has a Bluetooth audio receiver sadly I can't mo the Bluetooth audio because I am recording on the device I've done para to however it does sound very good and yeah it just works as you would expect it pairs easily and no problems at all it's running off USB micro here well it's just 5 volts I guess because you have well this battery positive and negative here I'm not sure if it can actually take a battery or if it has just 5 volts training it's probably just 5 volts and so it was a three-and-a-half millimeter audio jack here that's rather handy and some control buttons you have mode there to switch between USB and micro SD and Bluetooth as pause and play and next in previous and repeat these also work as a volume control if you hold them down and the