24*7 hrs work time and 100% loading capacity. High efficiency transformer with stable output and low consumption. ^^ Home circuit breaker not trip off at the starting moment. ^^ Over current protection. There are 2 input mini circuit breakers installed, once an over current or short circuit happens, the circuit breaker will trip off. ^^ This voltage converter can be used in 110 volt countries and 220volt countries. It will convert from 220v-240v to 110v-120v and from 110v-120v to 220v-240v. ^^ CE, FCC, RoHS Certified, Suitable for Water dispenser, fan fax machine, air machine, computer, etc.