Brand Name : JERTECH Model Number : JR7 Private Mold : Yes Tracking Method : Optical Type : 2.4Ghz Wireless Interface Type : usb Number of Rollers : 1 Number of Buttons : 4 Application : Desktop, LAPTOP DPI : 1200, 1600, Switchable, 2400, 3200, 1200/1600/2400/3200 Style : Gaming, Programmable, Mini Hand Orientation : Both Hands Interface : USB 2.0 Key Number : 4 Keys with DPI Button Battery : 1*AA Work distance : 10m Support system : Windows xp/Vista/Win7/8/10 Mac OS X