Motion sensor/detector
A device that detects movement in an area that persons should not be in (ie: an intruder) and alerts the control panel for your security system. Depending on how this is set up, it can either trigger an audible alarm on site or alert your security monitoring centre. Motion sensors can also be used to activate security lighting.
Monitored alarm system
A monitored alarm system will alert a call centre if the alarm gets triggered and this call centre will either contact the owner/occupant, contact the police or despatch a patrol vehicle depending on your service contract. Check you know which service you are paying for.
Unmonitored alarm system
This system sets off a loud siren inside and outside the home when the alarm is tripped. This system relies on your neighbours nearby to call the police if you are not home.
Window and door sensors
Door and window sensors will sound an alarm (emit a siren, trigger your home security system or sending you an alert on your phone) when someone picks a lock or climbs through an open window or door.