Perfect for portable and battery-powered projects Delivers 2 x 2.8W channels into 4 ohm impedance speakers (@ 10% THD) Automatic Gain control to keep your audio from clipping or distorting. Class D amp with 89% efficiency when driving an 8ohm speaker at 1.5 Watt Includes 3.5mm screw-terminal blocks so you can easily attach/detach your speakers