Specification Light source - Red laser diode Keyboard layout - 17mm sized QWERTY layout Keyboard size - Approx. 240mm*105mm Keyboard position - Approx. 100mm from keyboard device Projection surface - Non-reflective, opaque flat surface Visibility - Visible in 1000-5000 lux ambient light Illumination - Visible in incandescent light of 1800 lux or more Detection rate - Up to 400 characters per minute Effective key stroke - Approx. 2mm Operating surface - Any flat surface Power source - Integral lithium ion battery Battery capacity - 830mAH(Max)@3.7V Adapter - Rating 1A @ 5V Interface - RS232C serial Bluetooth - v1.1 class 2 Power consumption - max. 3W@5V Temperature operation - Approx. 0~35°C Temperature – storage - Approx. -20~50°C - Windows Mobile™ Pocket PC & Smart Phone edition - Palm OS, Blackberry, Symbian - Windows 2000/XP or higher”