The Shelly BLU Wall Switch 4 is a versatile four-button Bluetooth switch that supports single, double, triple, and long press, enabling up to 16 customizable actions or scenes. It is battery-powered, running on 1 x CR2032 (3V) battery for up to 2 years of low-maintenance operation. This switch offers flexible mounting options and can be used as a fixed wall switch with support for a wide range of 3rd-party frames. A Shelly BLU Gateway or any Shelly Plus, Pro, Gen3 or Gen4 device (excluding sensors) is needed to use this device with the Shelly Smart Control app or any home automation system. Control your devices from anywhere using the Shelly Smart Control app or voice assistants like Alexa, Google Home, or SmartThings. This device requires a Bluetooth Gateway.