RDDW20F-05 is a switching power supply manufactured by the company, Mean Well. It is rated for 20 watts, with an output of 5 volts, and has a universal AC input of 90-264 VAC. It features overload protection, short circuit protection, and over-temperature protection. The power supply is also designed to be “no load” efficient and has a 93% high efficiency rate. The unit has UL and TUV safety approvals, and is suitable for LED lighting applications, point-of-sales machines, and industrial systems.