bluetooth or USB mouse - which uses more power?

[liquorman]

I am looking to buy a mouse for my laptop, but I can't figure out if I should get Bluetooth or USB.

Which takes more power:
Leaving bluetooth on (my laptop allows turning Bluetooth on seperately from internet)
or
Plugging in USB mouse (mouse uses USB power)

My main concern is maximizing battery life.

Thanks

 

[c.d.e]

The usb mouse will use power as long as its plugged in (Not counting mice that can usb "sleep"). The bluetooth will take power as long as you leave it on (Not including sleep mode either). Since both can be powered from USB with a maximum of 500ma @ 5v, normally at 100ma @ 5v. Not much of a difference in terms of battery life.