Outdoor device won't register inside.
All these wireless weather station devices have to be paired to the base unit whenever the batteries are changed in any of the remotes. It's a poor design issue, but there is no way around it, due to the nature of wireless operation.
Place both units near each other and look on the back of your base and remote sensor units, you should find a reset button (or a small hole). Either press the button or use the end of a paper clip to depress and hold the reset on each unit; Base 1st, then the remote 2nd.
After a brief moment, the remote should register with the base and you'll be back getting wireless readings.
Hope you find this Very Helpful and best regards!
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