HIGH VOLTAGE CONVERSION TECHNOLOGY <p>This up and down voltage transformer converter has automatic voltage conversion technology which makes it safer and easier use, it can detect the input voltage and convert to the corresponding you need. We have designed this transformer converter with the latest high-level voltage transformer which can be used perfectly well in your home.</li><br> <p>It will convert from 220-240 volt to 110-120 volt AND from 110-120 volt to 220-240 volt 50 60 Hz, The Universal 220v Output Socket will accept all types of plugs except the Big South African plug. Provided 100% FULL Load Capacity.</li><br> <p>This premium and high functioning transformer converter features a heavy-duty power cord with a standard US 3-prong plug, this ST-PRO-3000 has a total of 4 AC outputs, two designated for 110V with US standard outlets, the other two for 220V, one with a universal outlet, the other with a German/Schuko outlet, plus a 5V standard USB port, a unique feature of the ST-PRO series and 1st in the industry. And most importantly, all three outputs can be used simultaneously and continuously. What are you waiting for? Click add to cart and get this portable and highly effective up and down transformer converter now!</li><br> PS：The onside socket's color is random（black or White).