The new SDA16 door alarm is designed to continually monitor the status of a door. When the door is opened without authorization, an alarm is triggered to alert the security violation. This alarm features a Peizo horn which blasts a deafening 105+ decibels to alert the violation. This unit is ideal for emergency doors as well as stairwell doors and rear exit doors in retail environments. The unit easily complements existing hardware making any opening alarmed. The SDA16 door alarm is typically mounted on the interior of the door frame or door and is paired with a magnet mounted on the opposing side of the door gap. Adjustable REX and passage time delay for 7, 10, 15, or 20 sec. Manual (default) or automatic alarm reset adjustable for 2, 5 or 10 minutes. Adjustable LED colors indicating armed or violated states.