PAM8403 2-Kanals Audio Forsterker Modul 3W x 2 m/ Volum Kontroll - USB Strøm
Operating voltage: 2.5V-5.5V
Maximum output power: 3W*2(5V 4Ω)
Overall height after installed is about 16mm.
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.