The Smart Pill ON-OFF Micro are potential-free relays that can be installed in a flush-mounted box or similar enclosure. They are used to switch one or more devices on or off, such as electric ovens or garage door motors. The relays can be controlled via Bluetooth using an app, a smart switch or a push button switch. You can use them in either ON/OFF or pulse mode to generate pulses for, for example, a garage door motor.