Key features  Work comfortably for long periods of time, while preventing arm and wrist complains  Comfortable thumb rest and rubber coating for perfect grip  Speed select button (800/1200/1600 DPI)  Storable USB micro-receiver  2 thumb buttons: Browser back & next  On-off switch  Connectivity  Connection type wireless  Bluetooth no  Wireless protocols RF 2.4GHz  Wireless range 10 m  Receiver included yes  USB version 2.0  Connector type USB