Shelly Plus Smoke is a wire-free photoelectric smoke alarm that combines a local audible and visual alarm with connected notifications. It is designed for residential smoke detection without fixed power wiring and includes a test function, Hush mode and low-battery warning.
Wi-Fi and Bluetooth connectivity allow it to join the Shelly ecosystem, while the alarm itself provides a loud sound output of more than 85 dB together with LED indication when smoke is detected. It uses one CR123A battery; Shelly specifies up to five years of battery life with the original battery and a device lifespan of ten years.