Power Access, Jamb Mount Residential Automatic Door Opener
The Power Access Model 2300 automatic door openers are designed to provide for easy opening and closing of doors by the touch of a remote control switch. The 2300 Model is designed for light residential use and is intended for use where the door is opened primarily via remote access. It is not intended for use when the door is open and closed manually on a regular basis. When opened manually with this device installed, a drag will be felt on the door and the arm may jump the fitting if the door is opened too quickly.
More information: http://www.universaldesignspecialists.com/power-access-jamb-mount-residential-automatic-door-opener/