The E7 is an optical mouse that can work from up to 33 feet away from your computer. When not in use, the low profile nano receiver can store conveniently in the battery compartment. The battery compartment also has slots for two AA batteries. Although only one battery is needed for the mouse to function, there are two benefits for using a second battery- you won't have to change your batteries for up to a year, and the weight of the second battery provides a steadier feel for precision work. 2.4 GHz wireless optical mouse BRAND : IOGEAR
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