-Overload protection -Overheating protection -Short circuit protection -Efficient and smart -Precision voltage -Precise input voltage selection according to the country where it is being used -Suitable for Water dispenser, priter rice cooker, fan fax machine, air machine, computer -Select proper input voltage switch at the back of the. Transformer -Connect the converter onto a power socket. Insert your appliance plug into the multi socket on the transformer & turn power on -Purely use for AC output with all types of appliances rated 0-250 watts -Switch on AC 117V: Input 110V/120V, Output AC 220V/240V -Switch on AC 230V: Input 220V/240V, Output AC 110V/120V -AC 117V suit for using in: America, Canada, Japan, Brazil, Taiwan, Mexcio etc -AC 230V suit for using in: China, European Union Countries, Middle East etc -For indoor use only. Make sure correct voltage is selected before use -Overload protection -Overheating protection -Short circuit protection -Efficient and smart no specific requirement . China