I have them for over a year... Never had any problems and very quick response when I have accidentally set off the alarm. They don't call you on the phone, they check on you through the alarm system. You talk with them over a speaker in the main control pad.
I would recommend them.
Even have outdoor surveillance cameras through them that I can monitor from my cell phone.
I watched a crew of workers put in my swimming pool a year ago over my cell phone while I was out of town working.
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