10M 2.4G Wireless USB Wheel Optical Mouse for PC Laptop Operation distance is cloesly related to the environment. Battery life may be different for personal habit of using mouse. In case of mouse failure, please check battery power and replace it as necessary. The mouse will shut off automatically and enter sleeping mode for saving power when it's not used for a long time; to wake it up, press the right or left button. Never waste the battery at will or throw it in fire. Put replaced battery into battery recycle bin.