Optomas 1080p ultra short throw projector the eh319ust is perfect for businesses schools and colleges it is bright and a throw ratio of 0251 means that it can project a 100 image from just 55cm away and having the projector installed so close to the screen avoids any shadows being cast across the screen from the presenter it provides a complete package for engaging learning with many features including two hdmi inputs powered usb port powerful 16 w built in speaker improved lamp