Trust MI-3500X. Device interface: RF Wireless, Movement detection technology: Optical, Movement resolution: 400 DPI. Battery technology: Alkaline, Battery type: AAA. Minimum processor: Pentium, Minimum hard disk space: 10 MB, Minimum RAM: 64 MB. Mouse dimensions (WxDxH): 67 x 41 x 129 mm, Receiver dimensions (WxDxH): 46 x 30 x 96 mm. Certification: CE