The Buddy Box allows for the use of two RV's to plug into a single 240V/50A RV receptacle. It is important to note that a 50A RV receptacle actually supplies 100A of service; 50A per line. The Buddy Box splits each line to a seperate RV, with a maximum current of 50A per RV, as opposed to 100A to a single RV. Unit is great for extra guests and rallies. Made of impact resistant ABS plastic, will not corrode, and is weather resistant. 1 year warranty.