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That is the model number and the power comes from connecting the thermostat where the existing one was located and light up the LED display
Sorry, there was a problem. Please try again later.The Nest Learning Thermostat has an internal battery that remains charged by pulling a small trickle charge from the existing HVAC wires. Details here: https://nest.com/support/article/When-Nest-needs-a-common-C-wire
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