Works perfectly. Barely used. Basically brand new. Asking $300 obo. Pickup in Newbury park. ABOUT: The Electrical Management System (EMS) helps to protect your RV against voltage fluctuations, power surges, and incorrectly wired shore power which can cause severe and costly damage to RV appliances and electronics. Improved design features include 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. The sleek, compact portable design makes the unit easy to use and store. Plug-and-play application. Designed for recreational vehicle use only. Built-in Scrolling Digital Display • Previous Error Code (PE) • Normal Operating Conditions (E0) • Open Neutral Protection (no power through) • Reverse Polarity Protection (E1) • Open Ground Protection (E2) • High Voltage Protection (Line 1-E3, Line 2-E5) • Low Voltage Protection (Line 1-E3, Line 2-E6) • High Frequency Protection (E7) • Low Frequency Protection (E8) • Provides Amperage Usage Reading EMS-PT50X Features • Over/under voltage protection • Open ground, open neutral, and reverse polarity detection and protection • Surge failure indicator • Current indication • Previous error code (PE) • A/C frequency protection • Time delay (136 seconds) • Built-in scrolling digital display • Weather-resistant / designed for outdoor use • All weather shield assembly • Rugged pull handle • Security locking bracket • Tough Lexan housing