Output short circuit protection, overload protection, polarity protection, overcharge, multiple protections to improve safety and security. This USB socket is very easy to install in 15 minutes: "+" is inserted into the positive pole, and "-" is placed in the negative pole. Features: Quick Charge 3.0 USB port to boost the charging process It works with input 12-24V and adjusts output from DC5V/3.4A to 9V/2.5A or 12V/2A accordingly With intelligent master chip, it could protect your devices against short circuit, over-voltage, over-current and over power Adopts fireproof PC material, durable to use Rubberized surface, comfortable hand feeling Compact and lightweight design offers portability Wide compatibility with most USB-powered devices