We have an old fashioned burglar alarm system with vibrators fitted to all downstairs windows and front and back doors. It is serviced yearly which costs about £87, but this includes free repairs if anything goes wrong, (only needed once in about 20 years). All the wires for the trembler devices were threaded through our plastic frames, a skill no longer around apparently. The only problem is having to put up with slightly raised eyebrows by the service engineers at our archaic system - not wireless!