【Brand New】 Door Knob Vibration Detection Alarm This item is brand new and unused, purchased from a store. The packaging has minor scratches from the store. Please refrain from purchasing if you are concerned about this. This security alarm operates for approximately 1000 hours on 3 AAA batteries. You can choose from two different sound options. The volume can be set to high, medium, or low. - Type: Security Alarm - Power Source: 3 AAA batteries - Volume Settings: High, Medium, Low - Functions: Alarm, Warning Sound Thank you for viewing. #SecurityAlarm #CrimePrevention #RobberyPrevention #TheftPrevention #Security #DoorKnobSecurity