Less Muscle Strain ErgonomicsAdvanced ergonomic computer mouse provides total comfort with 30° ergonomic handshake angel, contoured grips and premium matte finish.6 s s - new added forward and backward buttons on the side which browses the web, and processs files more efficiently and conveniently. Faster Wireless Transmission Speed 33FT/10M 2.4G wireless connection reduces all the interference and delays. Just plug the USB receiver into pc or laptop and your D-09 works instantly.No delay ,no interference.Mini usb receiver is stored back of the mouse,beside the battery. 3X Less Hand Movement800/1200/1600/2000/2400 DPI high precision sensor reduces muscle fatigue and boost your workflow. Cursor moves 3X faster than basic computer wireless mouse. 1 AA Battery, 2X LongerOnly 1 AA battery lasts up to 18 months. It enters sleep mode after you leave for 8 minutes ,only click any button to recall. D-09 wireless computer mouse saves time and money by practically redu