Home » Blog » 24V AC Power Supply, Doorbell Transformer 16-24 vac, C Wire Adapter for Smart Thermostat, Compatible with Thermostat for Ecobee, Sensi and Honeywell and All Versions of Ring Doorbell (240500-26ft)

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24V AC Power Supply, Doorbell Transformer 16-24 vac, C Wire Adapter for Smart Thermostat, Compatible with Thermostat for Ecobee, Sensi and Honeywell and All Versions of Ring Doorbell (240500-26ft)

Tech Under 30

October 16, 2025

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Price: $16.99 - $12.97
(as of Oct 16, 2025 02:03:06 UTC – Details)

From the brand

Essential Check #1 Before Purchase:

Check the doorbell and smart thermostat user manuals for voltage specs. Most doorbells run on 16–24V AC, and thermostats typically use 24V AC.

Is this power supply universally compatible with smart doorbells and thermostats？

Check the user manual for your doorbell and thermostat – they’ll list the required AC voltage. Most models typically run on 24V AC, but always confirm compatibility first.

Are the two output wires on this power supply different?

No difference – AC power isn’t polarity-sensitive. Wire the doorbell/thermostat first, then power on.

Product Dimensions ‏ : ‎ 1.57 x 1.97 x 2.36 inches; 13.12 ounces
Item model number ‏ : ‎ 240500-26ft
Date First Available ‏ : ‎ September 6, 2024
Manufacturer ‏ : ‎ Dadaodadao
ASIN ‏ : ‎ B0DG8XLSP6
Best Sellers Rank: #86,279 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #57 in Door Bell Transformers
Customer Reviews: 4.3 4.3 out of 5 stars 70 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });

【 24v Transformer 】 Input: 120VAC, Output: 24VAC 500mA; C wire adapter for smart thermostat, Special Transformers for Ring Doorbell Wired, Ring camera doorbell, Ring Chime Pro, Ring Doorbell Chime, Ring Wired Doorbell, Door Chime, Ring Doorbell Plus, Ring Doorbell, Ring Wired Doorbell Pro, Ring Doorbell Pro
【 24vac Transformer 】120VAC to 24v Transformer Power your Smart Thermostat, Ring Doorbell, Ring Video Doorbell, Ring Doorbell Pro 2, Ring Doorbell Pro, Ring Doorbell Wired, Ring Wired Doorbell, Ring Chime Pro, Ring Pro 2 Doorbell, Chime for Ring Doorbell, Wired Ring Doorbell
【 Ring Power Adapter 】Alternating current has no polarity, the non-polarity wire is much easier for quick installation, connect the two wires of the power output to the Smart Thermostat, Wired Ring Doorbell, Ring Chime Pro, Ring Video Doorbell, Ring Door Bell, Ring Video Doorbell Wired, Ring Doorbell Wired Pro
【 C Wire Adapter 】 With this Door bell transformer, you could able to charge your Ring door bell without any worry about interrupting, which makes it a wonderful Ring doorbell pro transformer. You don’t need to take off the battery inside the Wired ring doorbell and just connect this Ring doorbell transformer, keep doorbell charging any time you want
【 PROFESSIONAL 】DADAODADAO has engaged in developing and manufacturing Ring doorbell transformer for more than 10 years, The advanced production equipment and rigorous design ensure that each of our Doorbell power supply is of the best quality