... wireless space.* Has 256ID code there is no interference even many mice being used at the same time.* Automatically save power sleeping functions ... in receiver, outstanding design.* The mouse can be used as wired optical mouse when in recharging, we suggest you choose the better ... cable (5pin) also can be used for some cell phones, mp3, mp4* Operation system: IBM PC ,Windows 98, NT, ME, 2000/XP.* ...