Optical Dual Touch Technology Pair the T420 with Windows 7 and watch the Optical Dual Touch Technology works its magic turning the displayed image or spreadsheet figure into a multi-touch screen. Trainer or speaker can invite two audiences to come up to the board for a quick contest and trial. Integrated Speaker To help professional elites gain the competitive adge by enriching their meeting with multimedia resources, BenQ has built 12W speakers into the T420. The use of videos, music and sound effects make every presentation more engaging and effective. Ambient Light Sensor The T420 is built with an ambient light sensor to detect the amount of ambient lighting in its surrounding and adjust the display setting accordingly without user intervention. This means the audience can always enjoy optimal picture quality in office.
