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Once the power flips back on, the backup battery system will automatically recharge. The sensors, or switches, are the second part of the security system. The most basic alarm systems have these sensors fitted in the frames of windows and doors so that if they are opened, the circuit is broken and the alarm is triggered. Some are installed in a way that allows them to detect if someone tries to break in through a window by shattering the glass or removing one of the panes. Others may detect motion inside or outside of the home. The third essential part of a home security system is the alarm. There are many
different options as far as which type of alarm you can have installed. Some alarms are set to trigger a loud siren in order to deter potential burglars after
they attempt to get in to your home. You may also choose to install an alarm that will automatically contact a monitoring service, who will then attempt to contact you to see what the situation is, and can contact the proper authorities if necessary. There are many other options that can be added to a home security system beyond these three basic components. Many people choose to have a panic button installed by their bedside, or in an area of the house that is often in use.