This voltage converter protects your expensive electronics and provides superior power protection from damaging voltage fluctuations, surges, and spikes common in many countries overseas. 2 USB port chargers 3.4 A Max Output are independent from the AC power for safety of your electronic devices. 200 Watt Max Step Down Converter Converts 220/240 V to 110/120 V Led indicator light Fuse protected Ideal for fax machines, computers, typewriters, camera batteries, phone chargers and light portable equipment TRANSFORMER PURCHASE GUIDE : Remember to leave at least a 100% slack for the voltage converter transformer. Televisions, Heating appliances, Laser printers, Halogen & fluorescent bulbs and power tools spike when you turn them on. For these products you need to buy a voltage converter transformer that is at least 3-4 times the items capacity.