The 4640 auto equalizer is LCN's smart and reliable electrically powered low-energy automatic operator. It provides easy access for people with disabilities, or the elderly. Designed primarily for manual opening applications that occasionally required automatic opening. People moving through a door can use it as a normal rack and pinion door closer or, at the touch of a button, open the door automatically. An integrated digital control suite provides all electrical control functions. These self-contained units are suitable for use on single leaf doors or pair of doors where each leaf is equipped with an operator. Closer cylinder constructed of high strength cast iron, full complement bearing, 1-1/2" diameter piston, and 3/4" diameter double heat treated pinion journal. Variable opening time and force by adjustments to the electronic control module located on the operator assembly. Maximum hold open time adjustable up to approximately five minutes.