WKB3000UB - Adesso WKB-3000UB Wireless Mini Keyboard USB Streamlined full-featured RF keyboard built-in Track Ball, with Optical Technology 2.4 GHz radio frequency, USB Receiver Connector. 10 meters effective working range, farthest amount to 30 meters. 360-degree navigation, sleek and elegant design. With notebook keyboard module enables handheld operation and effortless typing.