Built-in / installation frame for 21-inch tablet (142997) frame only, without tablet! Please note that the speakers and microphones are located on the back of the tablet, which may limit the quality and volume of the sound options once the tablet is installed in a wall. The tablet is secured to the frame using the VESA mount and then mounted into a drywall or wooden wall. Walls are also possible, but this is only conditionally recommended due to potential heat buildup. Please note that the installation frames are not compatible with our aluminum covers! The installation frames are only suitable for the Primeone series.