The 21.5 inch interactive digital screen self-service terminal is a stand-alone device. This type of self-service terminal has a wide range of uses, such as interactive displays, kiosks, self-service stations, etc. Stand-alone touch screen self-service terminals refer to devices that do not need to be mounted on the wall or fixed to any surface, but are placed independently through a base or stand.
link:https://www.qingvision.net/digital-signage-display/interactive-digital-signage/21-5-inch-interactive-digital-screen.html