i don't think it has an off switch thou...or does it...?
but who cares, throw it in the cradle every night before you go to bed and it'll be fine for the whole day, even if you use it's constantly on.
Logitech MX900

but who cares, throw it in the cradle every night before you go to bed and it'll be fine for the whole day, even if you use it's constantly on.
Logitech MX900