Trust AMI MOUSE 250S WIRELESS. Device interface: RF Wireless, Movement detection technology: Optical. Battery technology: Nickel–Metal Hydride (NiMH). Minimum processor: Intel Pentium, Minimum RAM: 16 MB. Mouse weight: 0.1 kg. Compatibility: PC, Compatible operating systems: Microsoft Windows 98/ME, Microsoft Windows 2000 / XP, Mouse dimensions (WxDxH): 67 x 96 x 33 mm