Azio Mini Wireless Thumb Keyboard (KB178RT) Compact form factor perfect for HTPC or Multimedia PC input devices Built-in trackball mouse with left-hand mouse buttons for easy navigation 8 Dedicated Multimedia keys - Home, Back, Play/Pause, Stop, Forward, Mute, Vol +, Vol - 2.4 GHz wireless RF technology Effective range up to 30ft (10m) Scissors keycap architecture makes typing silent, responsive, and comfortable. Rechargeable Batteries via USB port of your PC