... box:12 Features Specification: super door stop alarmThe door wedge alarm is for indoor use only. Set behind any door... * Set ... down the trigger anchor and sounds the alarm. * To silence the doorstop alarm, turn it OFF. * Alarm sound: 125dB. * With ON / OFF switch ... . * Use a 9V battery, not included* The door alarm gives great protection for home, office, orMotel room when traveling.