Aduio Amplifier Board. Its 8403 IC based. This is wires audio amplifier board. You can power this board 5v using your mobile charger or can be by computer USB plug. You can use two motor 3/5 watts on both side L and R. And connect the Audio cord to LTR portion.
PAM8403 Audio Amplifier Circuit
1 x 8403 Audio amplifier circuit