Whether you're working at home, school or at the office, with the Zelo silent click wireless mouse you can fully concentrate on your work without being distracted by annoying click noises. Enjoy the sound of silence but with the same click and feel as any other mouse. Reduces key-click sounds with at least 90 Percent Speed select button (1000/1600/2400 DPI) Storable micro USB receiver 8 m wireless range The USB receiver is packed in the battery storage For left and right hand use Reduced sound The Zelo has reduced key-click sounds. This means that when pressing the buttons, it makes less noise compared to a regular mouse. On top of that, the Zelo comes with a precise optical sensor for accurate control of your work. Speed select button This mouse is specially made for all users. The speed select button on top of the mouse allows you to alter the speed of the cursor (1000/1600/2400 DPI). In this way, you can select the right speed for your type of work combined with personal preference. Also, its ambidextrous design allows left as well as right-handed people to use this mouse. Specifications General Height of main product (in mm); 96 mm Width of main product (in mm); 57 mm Depth of main product (in mm); 38 mm Total weight; 85 g Formfactor; standard Ergonomic; design no Connectivity Connection type; wireless Bluetooth; no Wireless range; 8 m Wireless protocols; RF 2.4GHz USB receiver included; yes USB version; 2.0 Connector type; USB Features Silent click; yes Software; no USB receiver storable; yes DPI adjustable; yes Power saving; yes Control Grip type; palm Horizontal scrolling; no Controls; left, right, dpi, on/off Number of buttons; 4 DPI button; yes On/off button; yes Programmable buttons; no Adjustable weight; no Suitable surface; non-reflective flat surface Left-right handed use; right-handed, left-handed Scroll wheel; yes Trackball; no