The Targus AMW56US Wireless Optical Laptop Mouse boasts comfort as well as innovative technology. It is ergonomically designed to fit any hand for extended periods of time. Featuring 2.4 GHz, it provides a stronger wireless signal for excellent tracking and five times greater range compared to most 27 MHz models. This mouse comes equipped with 2 AA Energizer Max batteries for up to eight months of battery life depending on frequency of use. A low powered indicator light gives you advanced notice when it is time for fresh batteries. With its Stow- N-Go feature, this mouse is ready for easy travel. Just keep the small receiver plugged into your computers USB port or tuck it away into the convenient storage compartment inside the mouse for on the go laptop users. This mouse is ready-to-use comfortable, and stylish with a technology that is convenient and highly functional.