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I really don't want a power cord running down my front door. Nor do I believe I have a plug close by.

Lipo battery or rechargeable USB battery then. You could extend the battery life by making it sleep on a cron if you don't need it on 24/7

Prefer not to have a change a battery for something on my front door. That’s why I’d like to hook into the doorbell power but then your outside with your equipment and tough to compete with tight commercial packages.