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All new 2019 50 amp Power Watchdog Smart Surge Protector + EPO emergency power off Portable Version offers a powerful 4800 Joules of advanced surge protection for your coach. Our Patent Pending Power Watchdog + EPO is the worlds first smart surge guard and surge protector with built-in Bluetooth connectivity so you can monitor live park power conditions on your smartphone in real time! Get text alerts of dangers before something catastrophic happens. The new EPO emergency power off units will automatically SHUT DOWN power if there are dangerous conditions of too high or low voltage open ground or open neutral as well as more. Unit automatically shuts down power if voltage drops below 104 V or over 132 V. Once power conditions are good and stable for 90 seconds the unit will turn back on automatically.