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Make sure your doorbell is fully charged. When the doorbell starts charging, its LED will flash orange rapidly for about 3 seconds. Please confirm you’ve seen this, and then let it charge for at least 5-6 hours.

To turn on or off the doorbell, press and hold the SYNC/RESET button for 3 seconds.

If you need to reset the doorbell, hold down the SYNC/RESET button for 5 seconds, the doorbell should blink red quickly while resetting. If the doorbell is unresponsive, try deactivating the anti-theft alarm as a precaution. Because if the anti-theft alarm is active, the doorbell cannot be factory reset until the alarm is disarmed. How to pause/stop the Anti-theft Alarm of your Tapo Doorbell

Note: Resetting the doorbell will erase all your doorbell settings and local videos. Make sure you've backed up all the important contents before attempting a reset.

After the reset, re-add the doorbell to your Tapo app. How to Set Up Your Tapo Camera Using the Tapo App