Genius NS-6005 Wireless Optical Mouse, Blue (NS-6005 Blue) The contoured shape is suitable for either hand and the gentle curved sides give your hand the support and comfort you need for all-day use. NS-6005 has a convenient battery compartment design that uses either an AA or AAA battery and a power switch is added to extend the battery life. The bi-directional 2.4GHz anti-interference technology ensures a reliable working distance of up to 10 meters. 2.4Ghz technology anti-interference and power saving 1000 dpi optical sensor for smooth movement control Innovative battery compartment design for AA or AAA battery Designed to fit comfortably in either hand Using only one AA battery, you can use the mouse for up to ten months