“I don’t have an existing door bell, how I supposed installed without any wire? It can be installed just using batteries?”

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• This item will need a 20Ohm resistor to work.

  Answered by CommunityAnswer 8 years ago

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• Hi Martin, if you don't have an existing doorbell, you will need to add a 20Ohm resistor for the doorbell to work.

  Answered by Zmodo 8 years ago

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