QPT-231, a portable projector, consists of a 250 g body and a detachable battery of 3.5 hours. With 100 lm and 50” projecting range at the maximum, it can be used independently with battery when electric connection is unavailable or without battery when at office. It gives great flexibility for traveling businessmen. The power key can be activated with a quick touch. The big keypad area integrates all functions, reducing the tooling numbers. Instead of using traditional fan, it uses aluminum alloy to reduce thermal and noise problem. It supports D-sub / AV-in standard, so users can connect mobile phone or laptop for instant sharing.