Hardwired security alarms will always be superior to wireless security alarms. The simple fact being, modern airwaves are being increasingly cluttered with Radio Frequency (RF) Interference. This which interfere with wireless security alarm systems are many and can range from the simple high voltage power line to wireless routers and radio towers..
The thing is, wireless is highly unpredictable, particularly in security alarm systems. You may have a perfectly sound wireless security alarm system for years, then all of a sudden the neighbour 3 blocks away decides to purchase a ham radio. All of a sudden, the monitoring station is getting panic alarm, the police are being send on what appears to be a weekly basis and you have fines from the city for excessive false alarms.
Hardwired security alarm systems, on the other hand, are far more reliable in that they are not as susceptible to the problems of RF. Sure, if there is a strong source of RF behind a motion detector some of the older models may falsely activate. However this is simply fixed by replacing the detector with one with a higher level of RF Shielding.
Fact of the matter is, no security alarm system is entirely free from the possibility of false alarms. Hardwired security alarm systems are, however, much less prone to issues. Hardwired security alarm detectors are also universally compatible between hardwired security alarm systems; Wireless security alarm detectors typically only function with the wireless security alarm system for which they were designed - this can result in expensive system replacements if one wireless security alarm detector fails.
There is more information on the differences between wireless and hardwired security alarm systems on my website at http://www.keepsafesystems.ca There is an article entitled "the truth about wireless security systems" in the archive.
I hope this answered your question.
http://www.keepsafesystems.ca - KeepSafe Systems installs services and provides alarm monitoring services for security alarm systems in the Vancouver area of the Lower Mainland Fraser Valley British Columbia.
The KeepSafe Systems service area includes but is not limited to North Vancouver, West Vancouver, Richmond, Delta, Tsawassen, Ladner, Surrey, Cloverdale, Abbotsford, Mission, Aldergrove, Maple Ridge, Haney, Port Coquitlam, Coquitlam, Port Moody, Burnaby, New Westminster, Kamloops, Kelowna, Courtney, Comox, Nanaimo, Lions Bay, Squamish and pretty much everywhere in between.