shelly 2.5 double relay switch and roller shutter wifi open source wireless home automation dual power metering ios android application (2 pack) ul certified shelly wifi-operated double relay switch & roller shutter - control a wide range of home appliances and office equipment (lights, power lines, garage doors, curtains, security systems, heating radiators, air conditioners, etc.) from anywhere with the smallest wifi-operated double relay switch with roller shutter functionality in the world – shelly 2.5