RioRand DC to DC Step Down Converter Inverter (12V to 5V 3A 15W Power Supply for Car Vehicle with Fixed USB) Powered by RioRand Advanced Technology All epoxy sealed containers with Waterproof Housing; Dual USB ports High efficiency: &gt;96%; Reliable, low heat dissipation max. 60 With overload / over-current / over / low voltage protection, stable performance Widely used in Car device, such as LED Display, Hard Disk Player, MP3, DVD, GPS, etc