How do I disconnect my home security alarm?

I have a home security system that was installed by the previous homeowners. A while back, it started going off at random intervals throughout the day, for no apparent reason. We tried disconnecting it, with no luck, and ended up having to turn off the circuit breaker it's attached to. This would be fine, if that particular circuit breaker didn't also control the electricity to the bathroom and my bedroom (no lights, no outlets, etc). Does anybody know how I can turn this GD alarm off once and for all?? Thanks in advance!
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Miami Locksmith

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