Smart Touch Kit II - for S1 Technology: Laser Image Calibration Technology Active screen area: 40~120inch( no sunshine room);40~100inch( sunshine room) Aspect Ratio 4:3/ 16:9/ 16:10 Throw ratio and compatible projector: Acer Smart Touch Kit II - for S1-0.29 to 0.7 Power requirements: 3.3V/2A for emitter, 5V / 0.5A for camera Latency: < 30ms Positional Accuracy: ±1 Pixel Signal refresh rate: 120 fps Calibration: Automatic Calibration (5s) / Semi-auto Calibration/ Manual Calibration Calibration advantage: Much easier for calibration with red light Multi-touch: Ten points touch. Pen and eraser can operate simultaneously. Software: Calibration Software, Whiteboard Software System requirements: Windows XP / Vista / Windows 7/ Windows 8/ Windows 10 Weight: 0.25kg for emitter and camera Technology: Laser Image Calibration Technology Compatibility: Acer S1-0.29 to 0.7 Series Projector