Plazma is a simple calming and relaxation app for people of ALL ages. It is visually stimulating and suitable for a range of abilities. Tap buttons to change effects. Plazma can be controlled by assistive technology switches that interface with your device (probably bluetooth) that produce character codes (1, 2, 3, 4 , Space , Enter) – all produce different changes in effects of the app and control the 4 effects buttons. Plazma will also work with the XBox Bluetooth controller and Microsoft Adaptive Controller.