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That approach is readily apparent in a feature that allows you to set how much time you have to leave the house before the alarm is set. The Nest Guard will give you an audio alert too, telling you how much time you have to get out. While the Nest Guard plugs into a wall, it also features a rechargeable onboard backup battery that gives you 12 hours if the power ever gets knocked out. The Nest Detect runs on a CR12A battery that promises two years of battery life. Backup cellular connectivity for those times your home Internet is down can be added for a $5 a month fee. Nest also plans to partner with MONI Smart Security for 24/7 monitoring, though that service won't be available for a few months.