SainSmart Mini PAM8403 5V Digital Amplifier Board USB Power Supply
Features* Operating voltage: 2.5V-5.5V* Maximum output power: 3W*2(5V 4Ω)* PCB size is about: length 30mm width 22mm overall height after installed is about 16mm* Built with switch Potentiometer, can adjust the volume & control power switch freely!* Flexible assembly usage.Usage* Suitable for battery or portable electronics products* Suitable for long time steady usage.Package List1 x PAM8403 mini 5V power amplifier board (Support USB Power supply)Note:please make sure the power supply is not more than 5.5V and please don't do reverse polarity for "+" and "-", or else, it will burn the board.