Local only alarms are the most basic security system you can install in your home.
It works with individual sensors mounted on the doors and windows.
The sensors are not connected to any control panel.
When the circuit is broken, an alarm sounds right from the sensor itself.
These are very easy to install can be found in department stores or online for under $100.
They don’t offer very high assurance since they can be easily disabled, and there is no monitoring.
