The number of sensors you need will depend on the size of your home. Most alarm systems feature 2-4 passive infrared sensors (PIRs) for motion detection, and 2-4 magnetic contact sensors on doors and windows. An alarm company will advise you of how many your property will need upon an inspecton.
Lisburn
Lisburn is a city in Northern Ireland in the southwest of Belfast, situated on the River Lagan between County Antrim and County Down. It provides a part of the Belfast metropolitan area and features a population of 71,465. Lisburn was only granted city rank in 2002 within the Queen's Golden Jubilee festivities. With regard to household improvement projects you're likely to be taking into account in the city of Lisburn, make sure to use trustworthy companies making the best from your home.