The Model DA4D "Door Chime" is a wireless motion sensor with a built-in RF transmitter, that sends a wireless signal (over 200 feet through floors and walls) to a remote receiver or multiple receivers. The receiver(s) provide a selection of two different, volume controlled, pleasant, alerting melodies to audibly detect where your attention is required.
Another exclusive design feature, is the motion sensor "eye", that looks directly out of the side, providing coverage directly below the entry, instead of others that cover unnecessary, valuable floor space resulting in many aggravating, redundant signals. The door sensor "eye" has a detection range of up to 25 feet and due to our high quality optical fresnel lens, can be modified to cover any desired area of coverage from a single door entry to double doors or even a warehouse roll up freight delivery bay door.
The Model DA4T is an "extra" motion sensor-transmitter that is simply added to the Model DA4D system, for monitoring additional doors, or areas of protection, without having to purchase another complete door chime system. The Model DA4T is simply attached to the second entry and can be programmed to alert with a different audible sound, if desired, to audibly distinguish where your attention is required.
The Model DARD is an "extra" receiver-sounder that is simply added to the Model DA4D system, for alerting notification in additional areas, without having to purchase another complete system. The Model DARD is simply plugged into the second desired location, for example: in the office area and also in the warehouse, when activated will alert to audibly distinguish where your attention is required, with a pleasant, volume controlled melody.
Note: The Model DARD is an "Optional Extra Sounder-Receiver", for another area. Therefore, it requires our Model DA4D to function.