Specifications Operating voltage 2 5V 5 5VMaximum output power 3W 2 5V 4Ω Length 29mmWidth 20mmOverall height after installed is about 16mm 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 Package included 1 x PAM8403 Audio Amplifier Module