Centralize lighting and device control across apartments, condos, or small commercial units without replacing tenant switches: install Shelly i4 DC Gen4 behind existing wall switches (powered by 5-24 V DC) and use up to four inputs (SW1-SW4) with presses and multi-click actions to trigger shared scenes, schedules, and alerts. Coordinate actions across units and common areas through the Shelly app, cloud, scripting, MQTT, webhooks, or KNXnet/IP - controlling loads via devices like Shelly 1 Gen4 and Plug Gen4 - so you can run an “End of day” scene that dims common-area lights via relays and logs usage. At the same time, a triple-press can notify maintenance instantly, reducing energy waste and operational overhead while keeping physical switches unchanged for tenants.
