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- Remove the battery cover from the base of the iT500 thermostat.
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- Take a note of the full device code. This will be needed to register your device and may be useful should you require any Technical Support.
![](https://support.salus-tech.com/DocsDisplay?zgId=20071085121&mode=inline&blockId=60cie92dfe661c2fc458b8e3d5b823f22b8a8)
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- With the thermostat facing down, insert one new Alkaline AA Battery into the right hand side.
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- Insert the second battery into the left hand side.
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- Ensure the batteries are inserted with the correct polarity and are fitted securely in the unit.
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- Replace the battery cover.
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