Acer X129H DLP 4800 Lumens XGA Long Throw ProjectorPIN Security Acer PIN Security offers the possibility to protect the Acer projector from unauthorised use and theft by setting a PIN. A lost PIN can only be reset by Acer Service after verification of ownership. Acer LumiSense Acer LumiSense technology uses an ambient light sensor to detect the brightness in the projection environment and optimally adjust the brightness and colour saturation to it. In addition, Acer LumiSense also analyses the