Electrical Management Systems (EMS) protect your RV against voltage fluctuations, power surges and incorrectly wired pedestals which can damage RV appliances and electronics. Improved design features state-of-the-art microprocessors, All Weather Shield Assembly, rugged pull handle, secure locking bracket, built-in scrolling digital display and a tough Lexan housing. Features:• Previous Error Code (PE)• A/C Frequency Protection• Time Delay (136 seconds)• Rugged Pull Handle• Built-in Scrolling Digital Display• Weather Resistant• Designed for Outdoor Use• Lifetime Warranty (excludes All Weather Shield Assembly). Accidental 240V Protection Surge Failure Indicator Current Indication | Progressive Industries EMS-PT30X 30 Amp EMS with Surge Protection, 18"L