Alarm System Types Perimeter Alarm Protection This type of alarm protection comprises a mixture of devices to secure the perimeter of the protected house. Contact Sensors can be fitted to external doors to detect the opening of the door. Contact Shock Sensors, which are a combination of a contact and an inertia (vibration) sensor can be fitted to windows or patio doors to detect forced entry, glass breakage and also the opening of a door or window. The obvious advantage of this type of protection is that detection is normally signalled before an intruder enters the protected premises as opposed to Trap (see below) protection which will only activate when intruders trigger motion sensors when they are inside the premises. The Contact Shock Sensor can detect someone trying to pry open a door or window as it measures vibration around where the device is fitted. A key advantage to Perimeter Protection is that the system can be fully armed while you are inside the premises thereby giving you complete peace of mind. Trap Protection This type of protection comprises Motion (Passive Infra-Red - PIR) sensors within the protected premises to detect movement while the system is armed. This type of protection is ideal for premises that are unoccupied for periods of time e.g. holiday home, small commercial premises. Combination This method combines both perimeter and trap protection. In this solution the perimeter is protected by a mix of Contact and Contact Shock Sensors covering all vulnerable doors and windows. Internally, strategically located motion sensors will detect and confirm intrusion. HKC’s system will allow the user to part set while in the premises and have peace of mind knowing that the perimeter is secure. Once the system is fully armed all internal motion sensors will become fully active. This is usually used when the premises is vacant.