Quick answer
A burglar alarm is a control panel connected to sensors. When the system is armed and a door contact opens or a motion sensor detects movement, the panel sounds the siren and sends an alert to your phone (and to anyone else you choose). Panic buttons trigger it manually even when the system is off.
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Shop all alarm products →Key takeaways
- Panel + sensors + siren + alerts.
- Door/window contacts protect the perimeter.
- Motion sensors cover rooms.
- Arm fully when away, partly at night.
- Backup battery keeps it working in power cuts.
01The parts
Burglar alarm
Door contactswindows ~ motion sensors ~ panic buttons
Control panel / hubwith backup battery
Sirenphone app alerts ~ GSM
02Arming modes
| Mode | What's active |
|---|---|
| Away | All sensors |
| Stay / night | Doors and windows; motion off where people sleep |
| Disarmed | Only panic buttons and 24-hour zones |
03Frequently asked questions
Does a burglar alarm call the police?
The alarm alerts you and anyone you set up; police or a response company are contacted separately unless you subscribe to a monitoring service.
Do alarms work in a power cut?
Yes, panels have backup batteries and wireless sensors have their own batteries.
