Add four rugged external usb 20 ports from a single usb connectionr r an all metal chassis and surface mounting or din rail mounting options makes this versatile for almost any environmentr optional external terminal block dc power connector can ensure full power to all four usb ports simultaneouslyr backed by a startechcom 2 year warranty and free lifetime technical supportr r this sturdy industrial grade usb hub can be wall mounted or installed onto a din rail for convenient access to its