The Hughes Autoformers Power Watchdog Smart Surge Protector + EPO-H (Emergency power off) gives 2,400 (30 Amp) or 4,800 (50 Amp) Joules of advanced surge protection. This patented power watchdog is the World's first smart surge protector with built-in Bluetooth so you can monitor your park power on a smart device in any moment. The new EPO-H will shut down power automatically if conditions of voltage are dangerous. The unit will shut down power if voltage drops below 104 volts or goes over 132 volts. Once the power is stable for 90 seconds, the surge protector will turn back on Automatically.