SMAKN&reg; DC/DC Converter 12V/24V/36V/48V Step Down to 5v 3A(MAX) Power Supply Module MINI-USB OUTPUT 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