ST type TCep up & down transformer is specially designed for such electronic equipment whose rated Ac voltage different from that of the local net voltage.They are safe for use within the rated voltage range. Input voltage:110V/220V(or customeried 100V, 115V, 120V,200V,230V 240V)Output voltage: 110V/220V(Or customeried 100V, 115V, 120V,200V,230V, 240V)