This AC WORKS brand Safety Switch Y-Cable EVY1430SW-036 is very durable with a length of 3 feet. It is a NEMA 14-30P to two NEMA 14-30R. The adapter is used to connect two different appliances, like a dryer and your EV charging cable, at once without having to plug and unplug cords all the time, running the risk for arcing and fire hazards. Why You Should Use This Product: sing this switch, you can plug two appliances in at once and power one appliance at a time, without tripping the breaker. Switching between powering your 4-prong dryer and EV charger has never been easier. Keep both items plugged in, one to each of the connectors, and then use the switch to power whichever item you are using at the time. You can even label the switches for more convenience.