$19.98
Save $114.01
was $133.99
Buy Now, Pay Later
As low as
$4
/ mo
Learn more
- – 4-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Wednesday, Oct 28
Recently Viewed
At a glance
- Condition
- New
- Number of Items
- 1
- Style
- Without Screw Holes
- Model
- PS D40
- Dimensions
- 2.13"D x 2.56"W x 3.94"H
- Power Source
- Corded Electric,Plug
- Mounting Type
- Wall Mount
Features 5
- Eliminate doorbell/ thermostat underpower hassle: 24V 40VA plug-in transformer replaces and upgrades underpowered transformer with this 24V AC transformer
- Specification: input voltage: 120 VAC, 60Hz; Output voltage: 24V, 40VA
- Safe and stable: auto-resetting (PTC) fused secondary, LED green power indicator, positive/ negative/ screw terminals
- Universal compatibility: this 24v transformer is compatible with Ring Video Doorbell, Ring Video Doorbell 2, Ring Video Doorbell Pro, Nest Skybell doorbell
- Also compatible with Nest, Ecobee, Honeywell, and Sensi smart thermostats, and other devices that require constant 24-volt power for operation;
Specs 18
| Brand | Hotop |
|---|---|
| Power Source | Corded Electric,Plug |
| Product Dimensions | 2.13"D x 2.56"W x 3.94"H |
| Mounting Type | Wall Mount |
| Current Rating | 1.5 A |
| Brand Name | Hotop |
| Model | PS D40 |
| Number of Items | 1 |
| UPC | 796168988969 |
| Number of Packs | 1 |
| Item Highlight | Compatible with Ring, Nest, Sensi Doorbell & Thermostats, PTC Fuse Protection, LED Power Indicator |
| Manufacturer | Hotop |
| Unit Count | 1 Count |
| Part Number | PS D40 |
| Maximum Frequency | 60 hertz |
| Minimum Frequency | 60 hertz |
| Item Dimensions D x W x H | 2.13"D x 2.56"W x 3.94"H |
| Specification Met | UL |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Oct 28
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.
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
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
Works with ecobee and ring
Number of Items: 2
Style: Without Screw Holes
Works with ring doorbell and ecobee thermostat. Plugs into electrical wall outlets.
Reviewed in the United States on August 8, 2026 by Army DIY
Very easy to install and is THE one to buy for the Ring4K doorbells
Number of Items: 1
Style: Without Screw Holes
If you have a new Gen3 Ring 4K Pro this is the video doorbell transformer to buy. VERY easy to install and now when you check device health it will show the power level as 1 (the one you want).
Reviewed in the United States on September 27, 2026 by AmazonShpr2000
Used to replace our Culligan Soft Water power supply.
Number of Items: 1
Style: Without Screw Holes
Replaced our Culligan Soft Water transformer. Works great! Has a very bright green indicator LED so you know it's working! Fit and functions as needed.
Reviewed in the United States on October 4, 2026 by JJ
No instructions included
Number of Items: 1
Style: Without Screw Holes
This rating would be a five but for the fact that no instructions came with the transformer; no reference to wiring for cameras was in, or on, the box. No instructions could be found online. The markings on the three terminal are 0, +, and 24 V. the correct combination was terminals 1 (0 V) and 3 (24 V) for an Eufy E240 Video doorbell camera (24v 40 VA).
...
show more
Reviewed in the United States on September 26, 2026 by Marcus Aurelius
Sprinkler opener
Number of Items: 1
Style: Without Screw Holes
Works well. Using it to open up sprinklers.
Reviewed in the United States on September 8, 2026 by Paul DeMarco
Very good quality and has been in service a long time
Number of Items: 1
Style: Without Screw Holes
Works great. Using to power thermostats on older HVAC equipment that does not have the “C” Blue wire.
Reviewed in the United States on August 22, 2026 by Mike
Works as it should
Number of Items: 1
Style: Without Screw Holes
Got this transformer to replace an older 16V transformer in my house as I needed up upgrade for a Tapo doorbell unit I received recently. I bought this transformer and a replacement 24V doorbell chime. This transformer seems to work well and performs as expected. Other reviews state that this transformer outputs higher than 24vac. Yes, that’s true but it’s on purpose. There is no regulation on these. It’s a straight step down transformer. The higher voltage will drop for two reasons. 1) current draw (load) and 2) cable run (length). Both of these things have a greater effect on voltage drop than a regulated power supply would have. People who are complaining about the higher voltage measured at the transformer clearly have no idea how this works. They just know enough to know how a DMM (voltmeter) works and that’s it. Additionally, most commercial circuits in medium to high end electronics have a tolerance for what the input voltage can be as well. Usually somewhere in the realm of +/- 10-15% of its highest input value. Moral of this story is, It’s perfectly safe to run this with a 24vac connected device. My credentials are I have a BS in manufacturing, and a PhD in Computer and electrical engineering.
...
show more
Reviewed in the United States on December 11, 2025 by D Wxby
No good, outputs over 24V
Number of Items: 1
Style: Without Screw Holes
Just like others, over voltage output at 27V. Unfortunately I didn't see those reviews warning about it and never checked until after return window. So stuck with an out of spec piece of junk.
Reviewed in the United States on June 29, 2026 by I Am Me