A device that converts household AC (alternating current) 100V power to DC (0~16V) (direct current) for model trains. In addition to controlling the running of trains, it supplies power to point switches, level crossings and signals, etc. It employs pulse width modulation (PWM control). Currently, the shipping cost for the U.S. is going up, so we are very soory but we don't recommend purchasing from U.S. customers, because the number of airplane has been significantly decreased. Furthermore, the delivery speed is very much slower than usual. Even the shipping company has no idea when the product will reach you. We strongly recommend to wait for placing orders until the shipping costs will be returned to normal costs. And also please do not place an order if you want the product delivered.