Doorbell wiring

[Skooterj]

I have a hard wired doorbell at my front door. Everyone comes to the service door of the garage. I want to add another switch at that door. But I do not want the hassle of running wire there. They make all kinds of wireless doorbells. So I know I can just do that, but I do not have anywhere convenient to plug the receiving unit into. Is there anyway to use the electrical 120 V current going into my current doorbell transformer to power the receiver on a wireless unit? Or any other suggestions?
I have also seen doorbells that say they can be used either wired or wireless. But have been unable to find one that says it will work with both.

 

[mike93lx]

There isn't a single outlet in the space you can plug the doorbell chime into? Not even a high mount one for something like a garage door opener?

 

[Skooterj]

Sure, I have outlets, but none I want to use up permanently with a door chime. Was wondering about using the 120 volt for the transformer for an duplex outlet. Putting a plug on the end of the transformer and plugging in the remote unit to that. My current chime is above my kitchen cabinets and a second chime would be better there than in one of my wall plugs.

 

[PoorUB]

Just buy a second wireless, battery powered door bell for the other door and keep the one you have.

 

[The Cobbler]

they make a wireless set up that signals a wired bell .
one example https://www.sti-usa.com/product/sti-3300/?goto_model=

 

[mikedodge]

Or full battery for both. They usually last a couple years before batteries die.

 

[Noltz]

Sounds like battery/battery is truly the simplest solution. Yes you could add a duplex where your transformer is wired in now but that's a lot of work cutting, patching and retrofitting when there's off-the-shelf solutions that end up being cheaper and easier.