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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🔋 Power your smart home with confidence—never miss a chime or temp update again!

ROBUST 30 VA CAPACITY - Generous wattage ensures stable performance for residential and commercial setups
PEACE OF MIND GUARANTEE - Dedicated customer support with refund or exchange if expectations aren’t met
POWER UP YOUR HOME TECH - Reliable 16V AC output powers multiple thermostats and doorbells effortlessly
UNIVERSAL COMPATIBILITY - Works seamlessly with most doorbell and thermostat brands—no compatibility worries
HASSLE FREE INSTALLATION - Quickly mounts with screws or clips for a secure, professional fit every time

The GIVEUBED Doorbell Transformer delivers a steady 16V AC at 30VA, designed to power multiple thermostats and doorbells with ease. Compatible with most brands and built for easy installation, it’s the reliable upgrade for residential, commercial, or industrial low-voltage systems. Backed by responsive customer service, it ensures your smart home devices stay energized and efficient.

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Maximum frequency	60 Hz
Minimum frequency	60 Hz
Manufacturer	YU ER
Part number	16V30VA
Item Weight	599 g
Product Dimensions	2.79 x 4.83 x 6.6 cm; 599 g
Item model number	16V30VA
Style	16V30VA
Wattage	30 watts
Item Package Quantity	1
Batteries Required?	No

GIVEUBEDDoorbell Transformer 16V 30VA AC Power Supply Thermostat Power Adapter Hardwired Door Chime Transformer

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