Shelly BLU Wall Switch 4 with Busch-Jaeger adapter is a wire-free four-button Bluetooth controller designed to fit compatible Busch-Jaeger wall-frame installations. Its four buttons support single, double, triple and long presses, giving up to 16 configurable actions for lighting, appliances, scenes and other automations.
The controller uses Bluetooth Low Energy, encrypted communication and a replaceable CR2032 battery with battery life specified by Shelly at up to two years. It can also be removed from the wall arrangement and used as a portable remote.