Author: Craig Lloyd / Source: howtogeek.com

If you’re thinking about getting the Nest Hello to replace your existing doorbell, it’s a great option. However, there are some things to keep in mind about the installation that makes the Hello a bit different than other video doorbells.
Your Existing Doorbell Must Be Hardwired
The most important you should know before considering the Nest Hello is that it must be connected to existing doorbell wiring.

For most houses, this isn’t a problem, as wired doorbells are pretty common. However, if your doorbell is wireless and runs off battery, the Nest Hello is incompatible unless you hire an electrician to run all-new doorbell wiring to your front door, which can be costly.
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Other video doorbells are the same way, though, including the SkyBell HD. The Ring Doorbell can be connected to existing doorbell wiring (and it’s recommended if that’s an option), but it also has its own internal battery so that it can operate completely by itself without the need for any wiring whatsoever (although it won’t be able to use your existing chime if you have one).
In the end, this shouldn’t be a huge problem for most homeowners, but it’s probably best to check that your current…
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