Relieves Hand Fatigue - With the latest ergonomic design, the wireless mouse perfectly matches the position of each of your fingers. Mini-contoured shape drastically reduces muscle strain by 30%. This computer mouse has 6 buttons. Side buttons, forward and back buttons, help you browse the web conveniently* USB receiver is stored on the back of the wireless mouse* Wireless Convenient & Freedom - This wireless mouse connects with the 2.4G wireless technology via a USB Nano receiver(stored on the back of the mouse, besides the battery).Transmission distance can up to 10m/33ft. Just plug and play, no drivers needed. Enjoy Your Efficient Life - Choose different DPI computer mouse for different needs-800/1200/1600/2000/2400(default 1200).For daily life - 800/1200 DPI is enough to meet your needs. For office, 1600/2000/2400 DPI can greatly enhance work efficiency by up to 130%. Longer Battery Life X 2 - This wireless computer mouse is powered by a AA battery whi