RioRand (TM) DC/DC Converter Car Power Inverter 12V Step Down to 9V 2A Power Supply Module, Non-isolated 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 Light compact, convenient to use and transport; Auto recovery Widely used in Car device, such as LED Display, Hard Disk Player, MP3, DVD, GPS, etc