The LED Power Supplies (QOMDC, QOMDC+CAP, and QOM-E-LED) are DC versions of our flagship, interior, power supply centers. Like the AC, QT line, the DC line is a highly flexible system that is built to exacting specs. They also provide superior performance and efficiency. Each unit is tested three times throughout production and has safety engineered into the product at every level. The QOMDC AND QOMDC+CAP bear the mark of CSA and can accommodate DC dimming via magnetic low voltage dimmers. The QOM-E-LED is CSA listed and can accommodate reverse phase 0-10V dimming. (We recommend speaking with a Q-Tran representative about your specific application before specifying a model.) They are built in our factory in the United States of America.