Features: brand new and high quality Before inserting the surge adapter and power cord into the power base, ensure that the corresponding circuit breaker is in the ""OFF"" position. After inserting the surge adapter connected to the power cable into the power base, dial the corresponding circuit breaker to the ""ON"" position. When the SURGE light comes on, the RV is protected by the SURGE. SURGE Indicates that there is no SURGE protection when the indicator is off,use in dry places. Function: Absorbs high voltage spikes and surges to protect your RV and electrical equipment from damage. Package Includes: 1x Surge Protector Specifications: Material:Plastic,Copper Type:30A Plug/Receptacle Type: 14-50P/14-50R Rating: 22500A max spike, 1050 Joule note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.