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24V 40VA Doorbell Transformer - Heavy-Duty Copper Core for Ring Pro/2 & Nest Hello, Easy Install Hardwired Power Supply, Thermostat/Chime Compatible

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Availability: Only 10 left in stock, order soon!
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Arrives Tuesday, May 5
Order within 14 hours and 31 minutes
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Features

  • Universal Compatibility - Certified for Ring Video Doorbell Pro/2, Nest Hello, Wyze, Eufy & most 16-24V smart doorbells. Includes dual-input terminals for thermostats/chime
  • Zero Voltage Drop & Anti-Overheat - Patented copper-core design maintains stable 24V output even under 40VA max load, eliminating "low voltage warnings" and extending doorbell lifespan by 3X
  • Power Multiple Thermostats/Doorbells - Replace and upgrade underpowered transformers with this 24V AC Transformer, while providing ample power to single or multiple thermostats and doorbells(Perfect replacement for an old transformer and will work with any wired door chime)
  • Easy to Install - The doorbell transformer is easy to replace and install with screws, unscrews or threaded clips to the electrical box, in a safe place
  • Trusted Brand Expertise - VIIVRIA has been specializing in digital accessories for years, consistently delivering high-quality products and services. We are committed to providing reliable, durable solutions for modern homes, with a focus on customer satisfaction and product performance

Description

VIIVRIA 24V Transformer is specifically designed to optimize the performance of Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring, Eufy Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation 24V/40VA Thermostat and Doorbell Transformer, Power Supply Compatible with Nest, Ecobee, Sensi and Honeywell Thermostat, Nest Hello Doorbell and All Versions of Ring Doorbell (4011MT) Powers thermostats and doorbells: replace underpowered transformers Easy to install: screw down and thread clamps to electrical box Input is 120 VAC, 60 Hz; Output: 24 V/ 40 VA This 24v transformer fits for Nest, Ecobee, Honeywell and Sensi smart thermostats; Also compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell Doorbell, and other devices that require constant 24 volt power for operation. About VIIVRIA: VIIVRIA specializes in high-quality digital accessories, delivering reliable products for modern homes. We focus on providing durable solutions and exceptional customer service, ensuring satisfaction with every purchase.

Brand: VIIVRIA


Power Source: Corded Electric


Product Dimensions: 2"D x 2"W x 3"H


Mounting Type: Wall Mount


Current Rating: 0.5 Amps


Specification Met: ‎UL


UPC: ‎712317236668


Manufacturer: ‎ZKRFID


Product Dimensions: ‎3.54 x 2.44 x 1.89 inches


Item Weight: ‎1.57 pounds


Item model number:


Date First Available: ‎April 1, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, May 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Great build quality
Great build quality for the price, I’ve installed about 10 so far. No issues. If you’re installing a Ring Pro wired doorbell you absolutely need a 40 VAC transformer to properly power it. I’ve tried 3x using 30 VAC and each time the customer gets an alert within 24 hours and limited functionality on the device. Take my word on the Ring Pro gen 2 use a 40 VAC. Simple to wire and mount. Has a nice metal mounting ring and just attach to old plate. ... show more
Reviewed in the United States on February 11, 2026 by Eric Eric

  • Recommended transformer for security doorbell with mechanical chime
Since installing a Ring security doorbell, I noticed my existing doorbell chime was hard to hear. I increased the voltage to the Ring security doorbell and the mechanical doorbell chime with this 24V transformer. The Ring doorbell and the mechanical chime both work great now. Although this new transformer was heavier and bigger, it still mounted on the wall plate without any modifications. ... show more
Reviewed in the United States on February 16, 2026 by cc548gg

  • I finally got my Ding Dong back!
After years of fussing with my wall chime, wiring, reading, replacing etc, my Ring doorbell now works perfectly. Wall Chime was getting a quiet Ding but no Dong. With the more powerful transformer, the Ring and the wall chime are working perfectly. A loud DING DONG. Dogs heard the faint Ding, I didn’t. They were my watch the front door dogs. If you have a mechanical inside chime, and it’s not got the umphh. Get this transformer. ... show more
Reviewed in the United States on March 8, 2026 by Greg from Dallas

  • transformer did not work
Dead on arrival, put out zero volts, bought 2, 1 so far is working, the second one is dead, o volts
Reviewed in the United States on February 16, 2026 by Dennis

  • great
Working great, installed for over a month now and running great without issues.
Reviewed in the United States on February 21, 2026 by Z

  • works with nest battery bell
I installed this so I didn't have to charge my nest battery door bell. It was easy to install. time will tell how long it will last.
Reviewed in the United States on December 9, 2024 by AA

  • The one you need for smart doorbells
Works with Eufy E340 doorbell. You need 30VA at least for smart doorbells. This is perfect, works and decent pricing.
Reviewed in the United States on January 31, 2026 by Michael

  • Great for ring doorbells
The voltage is strong enough to support my ring doorbell. Looks and feel very durable for its size. I would definitely recommend this product
Reviewed in the United States on January 28, 2026 by Rikki

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