Initially, when I got my Vivint security system, I was told that the system was battery backed up for 24 hours. This was never true, in fact, I found out recently that the system was only backed up for 12 hours. The new Sky system is only backed up for 6 to 8 hours. After a prolonged power failure of more than 8 hours, your home will be vulnerable to a break in and you'll be cleaned out. If you are buying a security system for security purposes then don't buy from Vivint. They have lied to me repeatedly in order to get a contract extension and now they refuse to cancel it when caught lying.
Bottom Line: No, I would not recommend this to a friend
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