Trust Wireless Optical Mini Mouse MI-4550Xp. Device interface: RF Wireless, Movement detection technology: Optical, Movement resolution: 800 DPI. Battery technology: Nickel–Metal Hydride (NiMH), Battery type: AAA. Minimum processor: Pentium CPU. Mouse dimensions (WxDxH): 60 x 98 x 34 mm. Compatible operating systems: Windows 98SE, ME, 2000, XP