The Hughes Autoformer Power Watchdog Bluetooth Portable Surge Protector gives you the best possible surge protection for your RV, featuring emergency shutdown in the event of dangerous power levels and Bluetooth technology, allowing you to monitor power levels right from your smartphone. Offers 3020 joules of surge protection. 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. Instant text alerts in the event of hazardous power conditions Fault alerts notify if open ground, open neutral, reverse polarity, open circuit, & miss-wiring is detected Offers 3020 joules of surge protection | Hughes Autoformers 30 Amp Hughes Autoformer Power Watchdog Bluetooth Portable Surge Protector in Black