The W320USTi is perfect for businesses, schools & colleges. It is bright & uses an advanced Touch Beam finger-touch interactive technology, enabling several people to work simultaneously on the screen without using a pen. The optimal throw ratio allows it to project an image from less than 0.5 m away. & having the projector installed so close to the screen avoids any shadows being cast across the screen from the presenter (s). The projector provides a complete package for engaging learning with many convenient features, including two HDMI inputs, powered USB (Universal Serial Bus) port, powerful built-in speaker, enhanced lamp life, compact chassis & a convenient mounting system for a fast & simple setup.