Features & details Left-handed ergonomic design - ergonomic vertical mouse that is specialized for left-handed users and perfect for larger hand size. The design is focused to create a natural palm and wrist position while gripping the mouse; 6 buttons Includes scroll wheel clickWireless connectivity - it COMES with a USB receiver with a compartment located under the mouse; you can connect by easily inserting the USB Receiver into your PC ports and it is readyComfortable to use- rubber coating at the for the palm and thumb support, provide you the perfect grip and elegant design; convenient design with an on/off switch; auto power-saving: mouse automatically enters power saving mode After 10 seconds of being standby mode, 8-10 minutes of being sleeping modeDriver free adjustable DPI - perimice-518l comes with an optical sensor that will offer you smooth and accurate tracking movements; you can change the sensitivity of the mouse by simply using the dpi switch button at the top of the mouse for reliable precision; 3 levels of DPI setting (800/1000/1600)