Total electrical protection from faulty park power and electrical issues inside the RV. Continuously monitors and displays: Voltage and amp draw (RMS) Low and high frequency protection Includes anti-theft lock ring on cord Multi-mode surge suppression Commercial-grade, brass receptacle Automatic reset on power restoration 10 second countdown startup sequence 128 second reset delay protects A/C compressor LCD display (English) Convenient Easy-T-Pull„ handles Compatible with 40301 Bluetooth LCD Display Protects against: Power surges Open ground Open neutral Elevated ground line current Low (<102V) and high (>136V) voltage Overheating receptacle Reverse polarity Miswired pedestal Low and high frequency protection