--- product_id: 69747978 title: "AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315\" Long Cable" brand: "viivria" price: "€ 36.35" currency: EUR in_stock: true reviews_count: 13 category: "Viivria" url: https://www.desertcart.pt/products/69747978-ac-24-volt-transformer-c-wire-adapter-compatible-with-all store_origin: PT region: Portugal --- # 315-inch (8m) ultra-long cable 24V AC output, steady power Universal compatibility with smart devices AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable **Brand:** viivria **Price:** € 36.35 **Availability:** ✅ In Stock ## Summary > ⚡ Power your smart home like a pro—never lose connection or control! ## Quick Answers - **What is this?** AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable by viivria - **How much does it cost?** € 36.35 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/69747978-ac-24-volt-transformer-c-wire-adapter-compatible-with-all) ## Best For - viivria enthusiasts ## Why This Product - Trusted viivria brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Extended Reach Freedom:** 315-inch cable lets you place your devices exactly where you want—no outlet limits. - • **Plug & Play Power Boost:** Effortlessly powers all Ring doorbells & smart thermostats without rewiring headaches. - • **Hassle-Free Installation:** No electrician needed—set up in minutes and keep your smart devices charged and ready. - • **Safe & Certified Reliability:** Certified battery backup ensures uninterrupted power and peace of mind. - • **Seamless Smart Home Integration:** Compatible with Nest, Ecobee, Honeywell, Sensi, and more for total home automation harmony. ## Overview The VIIVRIA AC 24 Volt Transformer with a 315-inch cable is a versatile, certified power adapter designed to provide consistent 24V AC power to all major smart thermostats and Ring doorbells. Its long cable and universal compatibility make it ideal for older homes or setups lacking a C-wire, enabling easy, safe installation without rewiring. Backed by professional support and a 180-day money-back guarantee, it’s the smart upgrade your connected home deserves. ## Description AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable - desertcart.com Review: PSA to desertcart Thermostat Users! - This is perfect for older houses! I only had 4 wires behind my old thermostat and knew essentially nothing about wiring a furnace. This is my first time ever changing a thermostat and it was pretty easy. There were a few special tweaks needed for an older house though. I have advice for people using the desertcart Thermostat with this! See below. -First and foremost you can get through this process as safe as possible if you use ChatGPT. Also, follow the normal instructions included when adding the device to the Alexa app. Turn off circuit breakers, etc. It's good to have a live wire tester to make sure it's safe (they're cheap on desertcart) OR just turn off every breaker to be sure there's no power to the wires. -The C wire needs to come from outside the thermostat while all the other wires are inside your wall, so you'll need to cut out a tiny bit of plastic so the C wire can also fit in where it's needed. There is a small door that flips up and down on the device you plug your thermostat into. Carefully rip that door off or you wont be able to close it with the C wire in the way. You'll understand when you get to wiring it. Once that door is removed and you cut out an area for the C wire, then you should be able to attach the actual thermostat with no issues. -The wire can but cut shorter if you like. Splice it correctly again if you do. Remember! ChatGPT can help if you don't know. -Do NOT twist the two C wires together because they go in different slots on the thermostat! KEEP THEM SEPARATE. -One wire goes into the C slot. The other wire will be intertwined with the RH (hot) wire. Works like a charm. 10/10. Review: Perfect power source for EcoBee thermostat. - Easy to use and install for my EcoBee smart thermostat. Wiring is literally plug and play with the existing two thermostat wires I had. No problems with power to the unit and has been running smooth since I installed it. ## Features - WIDELY USE: US power cable Powers your popular smart thermostats((Nest 1st/2nd, Ecobee, Honeywell, Sensi) and doorbells(Ring Video Doorbell, Ring Video Doorbell 2 & Ring Video Doorbell Pro,Nest Skybell , etc.) and other devices that require constant AC 24 volt power for operation, enables you to charge your devices safely. - EASY TO USE:Assemble along the wall from your outlet to the doorbell and thermostat without the existing doorbell or wiring. Easy installation and be able to set up in minutes. - LONG CABLE:Our cable is 8M(315 inch) long and you do not worry about the distance between the socket and the Honeywell Smart Wifi Thermostat. This allows you to easily plug it into an electrical outlet inside or outside your house. - SAFE AND CONVENIENT :Our battery backup has gotten certificate. A quick fix to the problem of "Low batter" you can charge it directly(plug adapter into outlet and power up). that means you don't need to remove your honeywell thermostat in order to charge up the battery.With an AC output of 24V/500mA, a perfect tool to meet your needs. - WHAT YOU GET- 1. High quality accessory 2. 180 Days money-back 3 . Professional customer service. VIIVRIA has a professional team which has been specialized in designing and manufacturing transformers for years, improving technologies to meet consumers' needs. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07DJ7RHS5 | | Best Sellers Rank | #3,370 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #5 in Door Bell Transformers | | Brand | VIIVRIA | | Brand Name | VIIVRIA | | Current Rating | 0.5 Amps | | Customer Reviews | 4.5 out of 5 stars 6,875 Reviews | | Included Components | AC 24 Volt Transformer with 315" Long Cable | | Item Dimensions D x W x H | 2.17"D x 3.94"W x 3.15"H | | Manufacturer | 1 | | Model | 1 | | Mounting Type | Wall Mount | | Part Number | 1 | | Power Source | Corded Electric | | Product Dimensions | 2.17"D x 3.94"W x 3.15"H | | Unit Count | 1.0 Count | ## Product Details - **Brand:** VIIVRIA - **Current Rating:** 0.5 Amps - **Mounting Type:** Wall Mount - **Power Source:** Corded Electric - **Product Dimensions:** 2.17"D x 3.94"W x 3.15"H ## Images ![AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable - Image 1](https://m.media-amazon.com/images/I/61ds7G4Ou0L.jpg) ## Questions & Answers **Q: Would 24v damage the nest hello? it only need 18v, not 24v.** A: I been using it for around 3 months with no issues with the Nest Hello. **Q: Does this work with Nest Hello?** A: Yes it does work with the nest, I'm using it with mine and a pellet stove **Q: The “ul” label is no longer included on the unit. is the unit being shipped longer ul certified?** A: I really wish people would just not respond if they don't know the answer... Anyway, I just moved and dug my Ring doorbell out of a box along with this transformer. When I installed it, I included a huge 250 Ohm resister for some reason, got the recommendation online. Regardless, the Ring was not charging, so I tested the voltage from the transformer and got 25 volts consistently, not the 24 volts it claims, and not the 8-24 volts my door bell wanted. Sure, I got an extra volt for free, but I don't know what that will do to electronics without knowing what kind of regulator they are using, if any. So, since it provides more voltage than stated, it might not be approved anymore - I don't know. I bought this in late 2019. **Q: Will this work with the vine 610 thermostat** A: This will work with any thermostat. It simply provides the 24V power needed assuming your tstat wire and doesn’t have the additional wires for 24v power. Most furnaces have the 120/24V transformer, but older homes tstat wire never had enough conductors. Newer homes should. Regardless, yes, this transformer with work. ## Customer Reviews ### ⭐⭐⭐⭐⭐ PSA to Amazon Thermostat Users! *by K***Z on May 13, 2026* This is perfect for older houses! I only had 4 wires behind my old thermostat and knew essentially nothing about wiring a furnace. This is my first time ever changing a thermostat and it was pretty easy. There were a few special tweaks needed for an older house though. I have advice for people using the Amazon Thermostat with this! See below. -First and foremost you can get through this process as safe as possible if you use ChatGPT. Also, follow the normal instructions included when adding the device to the Alexa app. Turn off circuit breakers, etc. It's good to have a live wire tester to make sure it's safe (they're cheap on Amazon) OR just turn off every breaker to be sure there's no power to the wires. -The C wire needs to come from outside the thermostat while all the other wires are inside your wall, so you'll need to cut out a tiny bit of plastic so the C wire can also fit in where it's needed. There is a small door that flips up and down on the device you plug your thermostat into. Carefully rip that door off or you wont be able to close it with the C wire in the way. You'll understand when you get to wiring it. Once that door is removed and you cut out an area for the C wire, then you should be able to attach the actual thermostat with no issues. -The wire can but cut shorter if you like. Splice it correctly again if you do. Remember! ChatGPT can help if you don't know. -Do NOT twist the two C wires together because they go in different slots on the thermostat! KEEP THEM SEPARATE. -One wire goes into the C slot. The other wire will be intertwined with the RH (hot) wire. Works like a charm. 10/10. ### ⭐⭐⭐⭐⭐ Perfect power source for EcoBee thermostat. *by J***6 on July 6, 2026* Easy to use and install for my EcoBee smart thermostat. Wiring is literally plug and play with the existing two thermostat wires I had. No problems with power to the unit and has been running smooth since I installed it. ### ⭐⭐⭐⭐⭐ It worked *by J***Z on July 6, 2026* Works as advertised I was able to connect my tapo D225 to do 24/7 surveillance without any problems and easy to assemble and install would definitely recommend if you want some equipment to run 24/7 ## Frequently Bought Together - AC 24 Volt Transformer, C Wire Adapter, Compatible with All Versions of Ring Doorbell and Thermostat for Ecobee,Sensi and Honeywell, 315" Long Cable - Ring Video Doorbell Wired (newest model), Use Two-Way Talk, advanced motion detection, HD camera and real-time alerts to monitor your front door (wiring required) - Ring Chime --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/69747978-ac-24-volt-transformer-c-wire-adapter-compatible-with-all](https://www.desertcart.pt/products/69747978-ac-24-volt-transformer-c-wire-adapter-compatible-with-all) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-07-13*