System requirementwindows 7, 8, 10usb portyou can download software by visiting Perixx websitespecificationdimension: 130x107x45 approximate weight: 134 g (batteries are not included)sensor: lasertrackball size: 34 mmdpi: 400/1000power supply: two AAA batteries required (Batteries are not included in package)number of buttons: 7number of programmable buttons: 5scroll wheel with middle click: yeswireless operating distance: 10 M (33 feet)wireless technology: 2.4GHz, with NAND receiver