Check out other listings on thermostats. You should find your answer in links to manuals. You will also need an external power supply to power your thermostat as well as batteries for backup. You must have the external power supply otherwise you will be changing the batteries at least every few weeks, which is not doable. The 'transformers' that provide the external power are readily available on-line and ebay. They plug into a wall outlet. Wiring diagrams will be found in the installation instructions if you search other postings.
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