RioRand(TM) DC to DC Power Supply Converter 12V to 5V 3A 15W Inverter with female USB for Car Vehicle Powered by RioRand advanced technology All epoxy sealed containers with Waterproof Housing; Non-isolated High efficiency: &gt;96%; Reliable, low heat dissipation max. 40 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