Complete your driveway alarm kit with this low-voltage Loud Siren. This siren alarm bell is compatible with Milton's existing wireless chime kits and can be added to your existing driveway alert system where the chime alone is not loud enough. The siren operates on 12V DC power and receives its power from a wired connection to the chime. The siren is extremely LOUD! It's perfect for industrial work environments, drive-thru applications, or any setting where a lot of volume is needed!