he CLiPtec RZS967 USB 800dpi Optical Mouse ‘Scroll Comfort II’ interface is USB V.1.1 or V.2.0 meaning that there's virtually no installation required - simply plug into any functional USB port and you are ready to 'mouse' with it. Features:-   Comfortable fit for either hand and for long-term use. Newest optical sensor and technology with high resolution of 800dpi. 2 standard buttons plus a scroll wheel for fast navigation and lets you browse with ease. Interface USB 2.0 / 1.1 Tracking Method 800dpi Tracking Engine High Resolution Optical Scrolling Capability 1 x Wheel Dimension 100(L) x 60 (W) x 38(H) mm Cable Length 145cm ± 1cm Hand Orientation - Design Friendly For Left and Right Hand