Manage lighting and devices across multiple apartments, condos, or small commercial units without replacing tenant switches: install Shelly i4 Gen4 behind existing wall switches in each unit, then use single/multi-click actions (up to four inputs) to trigger shared scenes, schedules, and alerts - like an “End of day” routine that dims common-area lights via Shelly relays and logs status, or a triple-press that sends a maintenance notification via webhook. You maintain centralized control in the Shelly app (with optional local control), while the physical switches remain exactly as tenants expect.
