This device is a Switching Power Supply, model S-150-12, and it converts AC (Alternating Current) to DC (Direct Current). Technical Specifications: Input Voltage: 100-120V AC or 200-240V AC (selected via manual switch based on your electrical grid). Output Voltage: 12V DC constant voltage. Current: 12.5 Amperes. Power: Approximately 150 Watts. For wholesale, minimum order is half a dozen.