About this item Switching Power Supply 5V, Convert AC 110V/220V to DC5V 30A Max, 150 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: mainly materials are plastic and aluminum, which are good for heat dissipation. The aluminum is carved directly, which makes the transformer easier for heat dissipation. Dimensions: 7.87 x 3.94 x 1.65 inches.