Items such as deadbolt locks, burglar alarms and smoke detectors often bring discounts of 5% each, depending on the company. Your insurance company may also offer a significant discount of 15% or 20% if you install a monitored home-security system. If you're thinking about buying such a system, check with your insurer to see which systems they recommend and which will earn you a discount. Article

Example:

Annual Insurance Premmium $1,200
20% discount (checkk with your agent) $240 per year or $20 per month
Monthly monitoring rate $31.95
Monthly cost after insurance discount $11.99