what can I say ... the product exceed my expectation . I have only have to change the mouse battery once and have not have to change the keyboard battery yet and I have be use it daily since November of 2010 ! it have a low profile receiver that plug into usb -lrb- no software need -rrb- and make it almost impossible to accidently get catch on it and potentionally break it . I wish the keyboard light up ; although that would burn thru battery faster . that be say , I think it should have a option to do so . if it do , then this product would be absolutely perfect . great product for a very fare price !