The fitting of the alarm was quite a lengthy process (about 5 hours) but the engineers did a marvellous job with all the wires, either hiding them or making sure that they were not unsightly. They also made slight changes to the installation plan to ensure the best protection possible. We opted for sensors upstairs and downstairs as well as a door sensor. This allows you to protect the whole of your home when going out or selected areas at different times. How easy is it to use? Both my children have been able to set and de-activate the alarm since they were 10 & 12 and if they can remember how to then anybody can!!