The W319UST, is perfect for businesses, schools & colleges. It is bright (3300 lm) & a throw ratio of 0.27:1 means that it can project a 100? 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. It provides a complete package for engaging learning with many advanced features, including two HDMI inputs, powered USB (Universal Serial Bus) port, powerful 16 W built-in speaker, enhanced lamp life, compact chassis & a completely ultimate mounting system for a fast & simple set up.