Do More Web & Search What is Dual Voltage in Electronics Share Pin Email Print Eekhoff Picture Lab / GettyImages Web & Search Best of the Web Search Engines Safety & Privacy Running a Website by Catherine Roseberry Catherine Roseberry is a former writer for Lifewire who has experience in technology consulting focused on mobile productivity. Updated May 27, 2019 If your mobile gadget is rated dual voltage then you do not require a transformer to convert the electrical current.Your mobile gadget will operate on both 110/125v and 220/250v currents. You will only need adapter plugs.Check the back of your mobile gear for a label that reads 100v/250v or says something similar to Wide Range Input. If your mobile gadget has a label like that, it will automatically adjust for the higher current. You may have to change it with a switch though. If you have to use a switch, remember to change the switch before getting connected. Continue Reading