Tru-Form Media 3150 Wireless Ergo Mini Trackball Keyboard. Removable 1000 trackball, scroll wheel, integrated wrist support, membrane key-switches, includes batteries, Multimedia Hot Keys Adesso Tru-Form Media 3150 – Wireless Ergo Mini Trackball Keyboard offers users a keyboard with an ergonomic design, built-in trackball for easy and comfortable browsing, multifuctional features and a wireless range of up to 30 feet. The WKB-3150UB is designed with the split key zones and sloped shape to make typing feel natural and effortless. The WKB-3150UB puts your hands, wrists, and forearms in their natural positions for maximum comfort and long use periods. The built in trackball not only enhances your web browsing experience by enhancing navigating precision, but also can be removed for occasional maintenance and cleaning. The trackball is just a fingertip away, eliminating the need to reach for your mouse or to move your hands away from their natural positions. The built-in Multimedia Hotkeys bring quick and easy access to your Multimedia tools. The mini-size of the keyboard adds portability and is clutter-free. We can “comfortably” say the Adesso WKB-3150UB will add some comfort to your typing and navigating experience! Specifications: Connectivity: 2.4 GHz RF Wireless Technology Interface: USB for usb wireless receiver Channels: 8 Frequencies with 65536 IDs per channel Sleep Mode: Automatic Power: (2) AAA Batteries Indicators: Num Lock, Caps Lock & Low Battery Multimedia Hotkeys: Play/Pause, Stop, Previous Track, Next Track, Volume Up, Volume Down, Mute Trackball Resolution:Optical Type with1000 DPI Trackball Dimensions: 0.98″ (25mm) Keyboard Dimensions: 13.8 x 9.4 x 1.5″ (350 x 239 x 38mm) Weight: 1.75 lbs (800g) Requirements: Operating System:Windows 2000 / XP / Vista / 7 / 8 / 10 Connectivity Interface: USB Port for USB Wireless Receiver Includes: Adesso 2.4GHz Wireless Mini Ergo Trackball Keyboard USB Wireless Receiver (2) AAA Batteries Quick Start Guide