Key Features Sensor detects the vibration of a window during an attempted forced entry Super loud siren 110d B+ provides strong deterrence against intruders Easy to install-self-adhesive pad supplied, no tools required Single push button for low battery testing For indoor use only & is ideal for remote areas Vibration Alarms Alarm sounds when there is an attempted forced entry What’s in the box • Vibration Alarm • Double-Sided Mounting Tape • 4 x LR44 Alkaline Batteries (included)