Keyboard projection: Light source: red diode laser Keyboard layout: 63 keys/full sized qwerty layout Keyboard size: 295 x 95mm projected keyboard size Keyboard position: 60mm from VKB unit Required projection surface: non-reflective, opaque flat surface Visibility: good contrast up to 600 lux ambient illumination Keystroke sensor: Ambient illumination: works under all standard indoor illuminations up to 600 lux Detection: rate up to 400 characters per minute Detection algorithm: multiple keystroke support Effective keystroke: approximately 2mm Operating surface: any firm flat surface with no protrusions greater than 1mm Bluetooth: Bluetooth specification: Bluetooth v1.1 class 2 Bluetooth profile supported: HID and SPP Range of frequency: 2.4GHz spectrum Transmission range: 9m Number of supported passkeys: 5 Electrical: Power source: integrated, 3.6V rechargeable lithium-ion battery Battery capacity: >120 minutes continuous typing Charge method: included 100 to 240V AC wall adapter Dimensions: approximately 35 x 92 x 25mm (1.38 x 3.6 x 1 inches) Compatibility: supports for PalmOS 5, PocketPC 2003, Windows Smartphone, Symbian OS, and Microsoft Windows 2000/XP (Mac OSX will work but drivers are not provided, see the bottom of this page for details) look below for a list of specific compatible devices Please note your device may still work properly if not on this list as long as it supports one of the OS listed above