With a volume controlled DING DONG tone and adjustable sensitivity for even the most sensitive retail stores, the AIR CHIME (MODEL AC100) is the only choice for those who do not wish to change batteries. It will take only a few minutes to install, simply plug it in to any standard plug, adjust the sensitivity and you are ready to go

It is not powered by batteries. The AC100 detects a change in air pressure and activates remotely when the door opens to your store or home and when the internal air pressure drops.

• The Air Chime is designed to work when air pressure change is detected by the opening of an exterior door within a 3,000 square foot facility.
• The unit plugs into any wall outlet and allows for the chime box to be hung in a vertical or horizontal position.
• This unit does not need to be near the door being protected.
• You may even place this unit in other rooms with a closed door in-between.