This welding simulator is very realistic. It uses white and blue LED’s to give a bright pulsating light similar to that of an electric arc welder. The circuit can be hidden inside a building on a model railway layout or diorama to provide activity and realism. The realistic effect is achieved by random length of flashes and a random length between Flashes. Small size Approx 20mm x 20mm x 10mm (L x W x H) .Operates from 6 to 20v Smooth DC or 9v Battery.