Shelly
Plus i4
A Wi-Fi and Bluetooth scene controller with 4 switch/button inputs that triggers scenes, automations, and webhooks from wired wall switches or buttons. Powered from 110-240 VAC and installs behind existing switches to add smart control without replacing them.
Setup guides
Roles it can fill
Native Shelly integration, local, no cloud required, with optional MQTT. Provides 4 dry switch/button inputs (SW1-SW4) on mains power (110-240 VAC) for triggering scenes, automations, and webhooks; supports scripting and BLE.