Battery door cover doesn't stay in place.  Needs a little scotch tape.  Other than that it works perfectly.  Controls up to 12 components,  24 Macro control functions allow up to 32 consecutive operations by a single button press. Clock and Timer function turns components on and off automatically Learning function for devices employing infrared remote Operating Distance - up to 33 feet. Power Requirements - (2) AA batteries (not included) Dimensions - 8-1/2H x 2-7/8W x 1-7/16D; weighs about 6 ounces.