Should I use an exit button, exit detector or both?

Exit Detector

The purpose of an exit detector is to detect an individual's legitimate exit through a supervised door. The detector must capture the individual's hand movement towards the door handle (or panic bar) and, prior to the actual opening of the door, warn the system of a pending exit. When the door opens, the system is able to discriminate between a valid exit and a forced entry. The exit detector can be used on both free exit and controlled exit doors. The exit detector provides automatic and hands free operation.

Exit Button

The exit button can replace the exit detector on controlled exit doors. The user is forced to press the exit button to actually unlock the door. Exit buttons cannot be used on free exit doors because if a user opens the door without pressing the button, a door forced alarm will be generated by the system.