TOOGOO(R) 90V-250V 18KW Power Electricity Energy Money Saving Box US Plug Stabilizes the voltage supply. Balance the current source. Prolongs the life of the electric devices, improves efficiency of appliances and protect devices. Prevents electrical overheating. Environment-friendly. Simple to connect, easy to use, maintenance free. Smart, sleek design with LED lights to indicate operation. Saving electricity means saving money saving money means earning money. Perfect for home or office.