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, USB port 3. 360-degree navigation, sleek and elegant design. 4. With notebook keyboard module enables handheld operation and effortless typing. Spec : 1. Frequency: 2.4GHz 2. Channel : 8 Channel 3. Mouse : Optical Type, 800 DPI Keyboard: 385 mm * 178 mm * 50 mm Receiver : 78mm * 21.5mm * 10mm carton: 510 * 262 * 415 mm Packing: 10 pcs / carton Cubic Feet 1.96