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