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Silent and Efficient: There is no fan inside the case, silent running. Porous metal shell makes heat dissipation more efficient. Compact small size, high efficiency, 5V stable output voltage protects your electronic products from destruction. (NOTE: 110V/220V must be selected by switch before use to avoid damage. 110V for USA/CA but 220V for EUR.) This Power Supply can be used for Led Display Screen, Led Sign, Led Lights, some type monitor camera etc. Multiple protection - With Over-voltage Protection, Overload Protection, Overheating Protection and Prevent Short Circuit. Widely used - High quality Switch Power Supply it is perfect for all 5V power supply 40A projects