This controller comes with 4 buttons, they are security arm button, disarm button, scenario button, and an SOS emergency button. Arm/disarm buttons are both setting buttons for security mode switching. Scenario button you can link with one scenario that you want. For example, in the back home scenario, one-button controls multiple devices, water boiler for bath, illumination light, Air-conditioner, TV, and etc. SOS button is triggered, the host will send an app notification to all family users.