100w DC Transformer. Switching Power Supply 5V, Convert AC 110V/220V to DC5V 20A Max,100 Watt Max.IN-DOOR USE ONLY! Smart device surge protection for Short-circuit Protection, Overload, Over Voltage,Over Temperature Protection. High efficiency, High Reliability, Low Temperature Rise Built-in EMI filter, low output ripple, noise, Rugged heavy duty enclosure, 100% Full load burn-in Tested. Parallel/Redundancy Operation is possible. Good performance: All our product are fully comply with the stands of EU Electrotechnical Commission. The mainly meterial are plastic and aluminum, which are good heat dissipation. The aluminum is carved directly, which make the transformer easier to heat dissipation. Quality Guaranteed: Free 2-year unlimited warranty , if you have any question about our LED transformer, please email to us. We will respond within 24 business hours