Yes, you need to remove your existing doorbell button. Leave the doorbell transformer as it is if you are providing power from the existing doorbell transformer.
How do you ship dbell Wi-Fi video doorbell?
Do you ship internationally?
Can I return my Wi-Fi video doorbell if it does not work?
What kind of Warranty dbell Wi-Fi video doorbell provides?
Is there a monthly service or monitoring fees?
Can dbell Wi-Fi video doorbell camera be used as an alternative surveillance camera?