The Philips Touch series are equipped with Optical Imaging or IR-Touch Technology. The Touchscreens utilise the Philips 24/7 commercial displays meaning high reliability & very low power consumption which saves substantially on energy costs. The Philips Touchs series work with all digiboard software available for touch screens & also with Windows 7 applications. Optical Imaging Touch Technology: This touch technique means that you can -write- quickly & accurately on the touch display even with a thin pen. The Multi Touch displays respond quickly & precisely to a touch on the screen without having to apply pressure. The touch screen can also be used as a multi-touch screen when combined with Windows 7. This allows for certain applications to be controlled with four fingers. Features Size: 65 Resolution: 1920 x 1080 Pixels Display brightness: 500 cd/m 2 Built-in speakers: Y Noise level 49d B.