You are biding for one piece of PAM8403 Audio Amplifier Board.This board could be powered by USB Power supply.
Operating voltage: 2.5V-5.5V
Maximum output power: 3W*2(5V 4)
PCB size is about: length 30mm width 22mm overall height after installed is about 16mm.
Flexible assembly usage.
1 / 2 / 3 pcs module without instruction or data sheet