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One AAA it comes with it You can pop it right off and change it Or when you’re installing it you have to pull a tab to use it
Sorry, there was a problem. Please try again later.We recommend using only high-quality 1.5 V AAA alkaline batteries from a known manufacturer. To change the batteries: - Pull the thermostat display off the base. - Remove the old batteries from the back of the thermostat display. - Insert the 2 new AAA alkaline batteries. - Push the thermostat display back onto the base until it clicks into place.
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