Work (What it does): It is an advanced electrical switch (MCB) that controls electricity and protects circuits from overload, short circuit, or voltage problems. It also connects to WiFi so you can control it using your mobile. GEYA Electrical Equipment Supply +1 Use: Turn ON/OFF electricity from your phone anywhere Protect home wiring from overload or short circuit Set timer/schedule for appliances (lights, heater, etc.) Smart home automation (with apps like Tuya / Smart Life)