Its very useful device. it has a very good power search to seek your address or details. no need to carry your paper diary. its very sleek and light to use. very easy in using. it has other features also like calendar, calculator, alarm etc. to remade you other thing. you can carry it with you where ever you go and you can use it in dark also. it has a powerful back light feature to show you things in dark. so friend go get it. its very cheap in terms of both cost as well as power. it takes only two lithium cell. you can reuse it when you find there is no more address to use. just punch in back of it with a needle and your all data will be erase from its memory. and if you do not want to erase all at once then you can delete them one by one.