You posted under the Do It Yourself section, so you may want to look at SimplySafe, X-10 and similar systems. There are several available, some allow you to setup phone calls to you and your designated backups instead of the police. RING has the option to send video to your phone and you can actually talk to the person at your door. Hope this helps.
I will caution you about Galaxy low voltage wiring, I had them out to repair a problem with the original low voltage wiring in our house, they made a repair, and I had to repair their repair.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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