MX-222 5D Wireless USB Optical Mouse [MS-22-20-WC] is the state-of-art professional Small Wireless Mouse. With the Ergonomic design, MX-222 is designed to be comfortable and specially fit for your hand position and avoid fatigue after use it for long period. Tranquil-design wheel for scrolling four contact points to reduce resistance and ensure excellent mobility and easy to control on different surfaces. MX-222 is powered by rechargable battery with the rechargable based unit.