The Dock Barricade is an active barrier that represents the next generation of innovative loading dock safety systems. The electric/hydraulic power unit provides quick and effortless operation. It can stop a four thousand (4,000) pound loaded truck at four (4) miles per hour. It is electronically operated and consists of an electrical bumper-style safety stop circuit to sense obstructions when lowering. Installation is simple, anchor the unit to the floor, and plug in. Mechanical unit, model DJG-100MW, features a manual hand crank winch to raise/lower barricade arm. All units include a lock bar on the arm post to restrict rotation of the barricade arm, padlock is NOT included. 115V 1-Phase standard