Cesert 2.4ghz Wireless Optical USB Mouse with Receiver for Macbook Air Pro Acer Chromebook and All Laptop (White) 2.4GHz digital wireless transmission, operation distance is up to 10 meters 800 dpi/1600 dpi, cursor speed adjustable Built-in mouse memory, no recoding is needed after battery replacement The service life of one AA alkaline battery is UP TO SIX MONTHS Ergonomically designed ideally for right-handed