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A single Nest Temperature Sensor costs $39 (roughly £25/AU$50 converted).

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It relies on a CR123 battery.

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The battery is supposed to last for up to two years. 

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You can use up to six Nest Temperature Sensors in a house. 

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Nest also sells three-packs for $99 (£70/AU$125 converted).

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You can name each sensor you buy and schedule them straight from the Nest app. 

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That way, you can optimize the heat and air conditioning in certain rooms at certain times of the day. 

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The Nest x Yale lock costs $249 (roughly £180/AU$315 converted).

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Like other Yale locks, the Nest x Yale version replaces your existing deadbolt. 

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This lock uses four AA batteries. 

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You should get an alert on your phone when the batteries are low.

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The low battery alert is important, since this lock doesn't have a keyhole. 

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The Nest Hello doorbell costs $229 (roughly £165/AU$290 converted).

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The hardwired doorbell replaces your existing doorbell wiring. 

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Like Nest's IQ cams, the Hello has 1080p HD live streaming, person alerts and facial recognition (if you pay for the Nest Aware service). 

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This doorbell also has two-way audio so you can chat with whoever's at your door straight from your phone. 

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