Built-in safety shutters protect users from the direct touch of the live parts on the socket outlets. Only one plug-type can be used at one time by sliding the knob selection. This adapter does not provide power or voltage switching. Please ensure that your devices support the voltage of the country you are in. This adapter may not work with certain high power appliances such as hair dryer. Check your appliance label to see if it requires less than 6A. Surge Protection. Built-in Safety Shutter. Power Indicator Light. Single Plug Safety Feature.