— powered by 2 replaceable AAA size cells — “mini finger” (“little finger”) batteries / accumulators. This size is common primarily in technology for which compactness is important, and computer mice are no exception (although 2 AAA batteries still take up more space than 1). All replaceable elements are convenient due to, in fact, the possibility of replacement — models of standard sizes AA and AAA are sold everywhere, and the process itself takes a minimum of time. In addition, the user has the choice between disposable batteries and rechargeable batteries; the former are cheaper, but require replacement when discharged, the latter can be recharged, but the battery and charger are quite expensive.
