AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable

I upgraded to an Amazon thermostat but didn't have a C wire. This worked great to power my thermostat. Since my thermostat is over the air return, I dropped power into the return and put an outlet behind the air filter (yes, I used rated cable.) A completely hidden installation. I love it when a plan comes together.

This is perfect for my Smart Thermostat that needed the extra 'C' wire for power. It made the retrofit so simple.

This unit worked well to power a Ring Wired doorbell. It is an easy solution where you dont have wiring running to your doorbell location but have a plug nearby.

Works fine with my sensi t-stat. no issues and easy to use

Would buy again

Worked as described. Came with plenty of wire length.

worked great. As soon as I hooked it up the smart thermostat worked like a charm

Super long cable (315 inches / ~26 feet / 8 meters) — This is the standout feature. You can route it from a distant outlet (garage, basement, or indoor wall) to your outdoor doorbell or upstairs thermostat without needing extensions or worrying about reach. Many shorter adapters (10-16 ft) fall short in real homes; this one gives you flexibility for clean, hidden installs along baseboards or exterior walls. Works seamlessly with all Ring Video Doorbell versions (including Pro, 2, 3/4, Plus), plus smart thermostats like Ecobee, Sensi, Honeywell, Nest (1st/2nd gen), and others needing 24V AC. Output is typically 24V/500mA, which matches or exceeds what these devices require for stable operation—no underpowering issues that cause random reboots or battery drain. If your setup lacks existing doorbell/transformer wiring or a C wire, and you want something affordable, long-reaching, and dead-reliable, grab this. It’s especially great for renters, older homes, or anyone avoiding wall modifications. Saved me from constant recharges and false alerts highly recommend for the price and convenience.

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I’ve been using this 24V transformer to hardwire my Eufy E340 smart doorbell, and it’s been working great so far. Installation was straightforward, especially with the long cable — it gave me plenty of flexibility to route it cleanly without needing extensions. The power output is stable, and my doorbell stays consistently charged without any dropouts or issues. I also like that it’s wall-mountable and compact enough to keep things tidy. It feels solid and reliable, not cheap or flimsy. Overall, it’s a simple but effective solution if you’re looking to avoid constantly recharging your smart doorbell battery. Definitely a worthwhile upgrade for a cleaner, more permanent setup.

Works great, used it to power my humidistat. Comes with lots of wire.

Solve all of your wired doorbell woes with this 24V transformer. Something reliable in a shifting and scary world.

Works perfectly. Supplied a consistent 23V to my Ring Doorbell Pro after a quick household renovation. The extremely long cord was actually a life saver as we were able to run it from the basement fuse box to the mechanical chime, spliced ultimately to the doorbell