VvW DC-DC Waterproof 9-27V 12V to 28V 10A/280W Boost Step Up Power Supply Module Car Regulated Power Supply Converter,Die-cast aluminum 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 (9-27v),Output voltage:28V/10A/280W.High efficiency:&gt;93%.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