This tiny device laser-project a keyboard on any flat surface. you can then type away accompanied by simulated key click sounds. It really is true future magic at its best. You'll be turning heads the moment you pull this baby from your pocket and use it to compose an e-mail on your Bluetooth enabled PDA or Cell Phone. The Laser Virtual Keyboard can approach typing speeds of a standard keyboard. * Specification: 1) Illumination: Visible in incandescent light of 1800lux 2) Detection rate: Over 400 characters per minute 3) Effective key stroke: Approx 2~5mm 4) Operating surface: Any flat surface 5) Power source: The USB bus power Lithium ion battery power. The DC input power 6) Battery capacity: 8300mAH(Max) @3.7V Replaceable soft-pack type 7) Adapter: Rating 1A @ 5V 8) Interface: USB 1.1 and 2.0 for PC Bluetooth (v1.1 class 2) for Mobile devices 9) Touch Switch: Switch the active/Standby mode manually 10) Power consumption: max. 3W@5V 11) Temperature operation: Approx 0~35 12) Temperature storage: Approx -20~50 * Compatible operating system: 1) Microsoft Windows Mobile 2003 pocket PC & Smartphone 2) Microsoft Windows Mobile 5.0 pocket PC & Smartphone 3) Microsoft Windows Mobile 6.0 pocket PC &Smartphone 4) Palm OS 5.x 5) RIM OS for Blackberry 6) Microsoft Windows 2000/XP/Vista 7) Symbian OS s60 3rd Edition (for Nokia) 8) Size: 37.5*39*93mm