VvW DC/DC Waterproof 11-22V 12V to 9V 2A/18W Step Down Voltage Converter Car Power Supply modules Powered by VvW advanced technology. Widely used in Car device, such as LED Display, Hard Disk Player, MP3, DVD, GPS, etc, All epoxy sealed containers with Waterproof Housing; Used in vehicles, security systems, telecommunications, medical equipments, instruments etc Input range: DC 12V (11-22v)Output voltage:9V/2A/36W.High efficiency:&gt;95%.Reliable, low heat dissipation max. 40 C; With overload / over-current / over / low voltage protection, stable performance. Light compact, convenient to use and transport; Auto recovery