4, 800 Joules of advanced surge protection | Smart Circuit Analyzer will shut down power to RV if a dangerous event occurs and an alert will be sent to your smartphone | Plug-n-play – Only 4 second delay power on after plugging in (others brands are up to 2 minutes) | Built in 90 second power-on delay after a fault to protect your AC unit | Complete LED Park Power Diagnostics with wireless fault alerts – Open ground, open neutral, reverse polarity, open circuit and miss-wired | Fit type: Universal Fit