Muilti points 21.5 inch IR Infrared Touch Screen overlay panel with 3mm anti-vandal glass. Just only can use for your 21.5 inch display or monitor, can't use on other size. Anti-light interference,no drift even in the sunlight, simple for installing, easy for integration. Free driver for Windows, Android and Linux, support Mac iOS with HID driver. Design for Kiosks, Touch Monitor, Touch all in one,and so on.