Description: Built-in installation doesn't effect rear appearance and there is no need to change the structure of rear projection, once position calibration is finished, there is no need to recalibrate when you change computer or move rear projection TV. Specification: Whiteboard Type: Interactive electronic whiteboard Operating Principle: Infrared image processing position tracking Active Size: Max 100 inch Applied To: Any rear projection television Aspect Ratio: 4:3, 16:9 Communication Interface: Connected to PC by USB Communication Distance: 5m by the USB standard communication distance Power Consumption: Less than 1w Response Time: Less than 25ms(it depends on computer) Stylus E-pen Light Emitted: Infrared Stylus E-pen Buttons: No button Stylus E-pen Trigger Mode: Positive direction trigger Stylus E-pen Trigger Pressure: Less than 120g Battery Required: Battery AAA OS Required: Windows 2000/XP/Vista/7, Linux, MAC OS X.