The Alpha Communications® DO-002 electric door opener is a low cost mortise type door opener that is designed to be used in certain types of hollow aluminum door frames. Under certain circumstances, the DO-002 can be used in wooden or hollow metal door frames. The DO-002 can be used in right-handed or left-handed installations, simply by turning the door opener upside down, during installation. The faceplate has rounded corners for a tight fit into standard door cut-outs. When used with an 8-16VAC input, the DO-002 makes a buzzing sound, when activated. When used with a 3-6VDC input, the DO-002 activates silently. NOTE: Many options are available for the DO-002 door opener, including different voltages (AC and DC), different finishes, availability of continuous duty activation, fail-safe operation, etc. Alpha Communications® carries a complete selection of electric door openers for virtually any application. Please contact our sales dept. for more detailed information. OPTIONAL DOOR OPENER: Model DO-002L. Same as DO-002 but with oversized faceplate to cover damage on existing door frames. DO-002L faceplate measures 1.375"W (35 mm) and10.25"H (260mm).