The desired function, traffic patterns, and physical design of the opening will determine the type of actuators used. Generally, for two-way traffic, an actuator is required on both the interior and exterior sides of the door. Designed to mount in a flush or surface mount box (sold separately) in/on a vertical surface near the controlled door Optional mounting in single gang electrical box (by others) Heavy industrial grade components provide vandal resistant mounting and weather-resistant switch standard Packaged with a decal to be applied to the controlled door