Depending on the model, see the Amazon description for an example:
https://www.amazon.com/Thomas-Carlon-Wireless-Doorbell-Button/dp/B003YHINLE
Quoting: "What number battery does door bell remote button4130T use?
Answer:
The button takes (2) 2032 round lithium batteries."
Note the description of the batteries flying away on installation, and the short life of 8 months, etc.
SOURCE: how do I change the battery in the wireless doorbell button?
in the wireless doorbell button, you can plug out the old battery, and then plug into the new one, be careful, new one should be the same type as the old one, try it , good luck!
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