This international 220 to 110 V voltage converter uses solid state circuitry to automatically detect and select wattage for your electronic device. The indicator lights show when low settings (0 to 49 W) or high settings (50 to 2000 W) are being appropriately applied while powering your hairdryer, shaver, irons, battery chargers and other appliances. Accidental overloads are corrected with the circuit breaker reset button. This converter set includes five polarized adapter plugs that can be stored in the travel pouch that comes with it.