Dynamic Shape: Well-designed, contoured shape seamlessly fits and moves with your palm. Streamlined shape brings you dynamic experience, as well as the comfortable experience with Ergonomic design. 2.4G Wireless Technology. Adopt the 2.4G frequency technology. 2.4G will give you a more comfortable, convenient and exact effect than the traditional FM radio wireless mouse. Energy Saving Mouse: Auto Power Off (APO)- the mouse will be switched off automatically when the USB Nano receiver is disconnected with your pc, or the PC is switched off. 12-month battery life on 1 AA battery practically eliminates the need to replace batteries. Battery life may vary based on user and computing conditions.