This Alarm/Chime is a low cost but effective way of alarming windows & doors with a 130dB alarm. By using the chime mode, home owners can be alerted of unwanted entry through doors or windows. Handy for shopkeepers who do not have line of sight to the entrance of the store at all times. This is an ideal weapon against bogus callers. Batteries included. Extra Batteries available. Double sided sticky pads provided in order to attach the unit to the window or door., Manufacturer: Minder