Description : 1. Streamlined full-featured RF keyboard built-in Track Ball, with Optical Technology, 2. 2.4 Ghz radio frequency, 10 meters effective working range 3. 360-degree navigation, sleek and elegant design. 4. With notebook keyboard module enables handheld operation and effortless typing. 5.Battery Type : 2 X AAA batteries Spec : 1. Frequency: 2.4GHz 2. Channel : 8 Channel 3. Hot Key : WWW Pre-Page Next-Page Volume-Up Volume-Down Mute E-Mail Suspend WWW-Stop WWW-Refresh WWW-Search My- Favorite 4. Mouse : Optical Type, 800 DPI 5.Receiver Connector:USB Keyboard 425 x 150 x 31.5 mm(W/D/H) Receiver 21.5 x 78 x 10 mm(W/D/H) Packing 10 pcs/carton