the output voltage is ac or dc?

It is a AC 16V30VA Transformer for Dooebell or thermostats

Does this doorbell transformer apply to nest hello wifi doorbell?

A doorbell with a working voltage of 16V can be used,such asRing Video Doorbell，Ring Doorbell Pro，Zmodo Smart Greet Wi-Fi Video Doorbell，Ezviz Doorbell，Eufy 2K wifi wifeless doorbell,Netatmo video doorbell,night owl doorbell,skybell slim line doorbell camera,yiroka doorbell camera,Maximus kuna doorbell camera,Arlo Doorbell and etc.

What is the operating temperature of this 16v ac transformer? need to install in attic with 130+ degrees f.

Well it depends on what you are hooking the transformer up to, as far as the atmosphere air temperature that high should not be a problem, but, if you are going to use it to install a vent fan the temperature won't be that high it will be a lot less, just make sure the device will operate with this transformer.

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24V40VA Doorbell Transformer

Product ID: 422979702

Details

Brand
GIVEUBED
Current Rating
40 Amps
Mounting Type
Plate Mount
Power Source
AC
Product Dimensions
1.3"D x 1.9"W

⚡24V AC output power

🏠Compatible with most doorbells & thermostats

🔧Easy screw or clip installation

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R$366

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power up your doorbell game — reliable, sleek, and ready to impress!

TRUSTED BY THOUSANDS - 4.4-star rating from 725+ users proves it’s the go-to transformer for modern smart home setups.
RELIABLE 24 V 40 VA POWER - Delivers consistent, stable voltage for multiple doorbells and thermostats without flicker or drop.
UNIVERSAL COMPATIBILITY - Works seamlessly with a wide range of residential, commercial, and industrial doorbell brands.
DURABLE COMPACT DESIGN - Small footprint (1.3"x1.9"x2.6") fits discreetly in any electrical box, built to last with premium materials.
PLUG PLAY INSTALLATION - Mounts effortlessly with screws or clips—no electrician needed, upgrade your system in minutes.

The GIVEUBED 24V 40VA Doorbell Transformer is a compact, high-performance AC power supply designed to replace outdated transformers. It provides stable 24VAC output compatible with most doorbells and thermostats, supports multiple devices simultaneously, and installs easily with screws or clips. Rated 4.4 stars by over 700 users, it’s a trusted, cost-effective upgrade for residential and commercial smart home systems.

Specifications

ASIN	B09PYKZYSM
Best Sellers Rank	#21,270 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #12 in Door Bell Transformers
Brand	GIVEUBED
Brand Name	GIVEUBED
Current Rating	40 Amps
Customer Reviews	4.4 out of 5 stars 735 Reviews
Item Dimensions D x W x H	1.3"D x 1.9"W x 2.6"H
Item Weight	700 Grams
Manufacturer	YU ER
Maximum Frequency	60 Hz
Minimum Frequency	60 Hz
Model	24V40VA
Mounting Type	Plate Mount
Part Number	24V40VA
Power Source	AC
Product Dimensions	1.3"D x 1.9"W x 2.6"H
Unit Count	1.0 Count

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