How to Turn Off Cordless Mouse and Keyboard when not in use I have purchased Cordless Logitech Ex 90 (Mouse and Keyboard) , and installed 2 batteries in mouse and also in keyboard i cant turn off the mouse , i am pressing green button and also removing the receiver from usb port then also there is light in mouse. Why any idea. YEs i am pressing green button but nothing happens . i dont want to drain batteries when not in use. Also how many hours do batteries work any idea. Like if i use mouse for 5 Hours daily then when will be battaries be drained.