This is a mini stereo amplifier. It is a fully functional, two-channel audio amplifier, with an integrated sleep mode function. You can disable it on your sketch if you are not using it or not needed by connecting the sleep pin on your board. Its specially good for some DIY project.
Power Supply: DC 3.6-5.5V (DO NOT apply over 5.5V, it damage the chip presently)
Output power: 3w+3w (4 ohms)
Size: 15.5*24mm (0.6*0.94'')