Capable of projecting a 100-inch image with only 1.7m distance to the projection surface,the Acer K138ST is an ultra-portable short throw LED projector with all the essential entertainment features enabling people to enjoy cinema on the go. Smaller than a sheet of A4 or letter-sized paper,and weighing just 0.75kg (1.7lbs),the K138ST has powerful built-in DTS sound audio so it can easily be carried anywhere without requiring additional speakers. The Acer LumiSense+ enabled K138ST is the world's first LED projector equipped with an intelligent ambient light sensor. This allows the projector to optimize image brightness and color saturation based on ambient lighting conditions,ideal when carried from place to place. The projected image is vibrant and sharp with 100,000:1 contrast at WXGA resolution,while built-in Bluetooth audio connectivity allows it to wirelessly stream audio to a nearby Bluetooth speaker or home theater.