Does this device come with a battery preinstalled? Mine did not

Mine did not come with any batteries.

Does this device have triggers for both temperature and humidity that can be used in alexa routines? if not do you make such a product?

Alexa can read the temp, but it cannot be used as a trigger for routines.

Will this work with smartthings hub?

Yes. Now Smartthings v3 hub assigns it the right device handler automatically so integrates well now. Try using the Smartthings classic app (instead of the new app) first to hook it to the hub. People have commented that it drops off frequently. I have found it to be design issue. If you open it up, you would find that the casing holding the battery is bit loose and allows battery t move around which, I am guessing, causing the connection drop. I got around this by wedging a piece of paper between battery steel casing and the plastic cover. It holds the battery in place and the sensor seems to be working ever since. It's been ~3 days only though.

How low will the temperature read? my echo plus seem to stop around 45 degrees f

The Echo 2nd generation plus stops reading temps about 32F. If you want temps below 32F! You'll need to update to the Echo 4th generation with hub. That one I've tested down to 14F as far as sensors. Stuck one in the freezer. Also note! Alexa doesn't see humidity at all regardless of the sensor connected by ZigBee at all on any of their Echo's with hubs built into them. Also true even if you use an different hub like the SmartThings 3rd hub.

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SONOFF SNZB-02 ZigBee Mini Indoor Temperature and Humidity Sensor for Checking the Room Climate, SONOFF ZigBee Bridge Required, Indoor Thermometer Hygrometer with Alert, Works with Alexa, Google Home

SONOFF SNZB-02 ZigBee Mini Indoor Temperature and Humidity Sensor for Checking the Room Climate, SONOFF ZigBee Bridge Required, Indoor Thermometer Hygrometer with Alert, Works with Alexa, Google Home

Product ID: 443850758

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💧Real-time Humidity Feedback

🔋Battery Operated

🌡️±0.2°C Accuracy

Description

🌍 Elevate Your Home's Climate Game!

FAMILY SHARING - Easily share access with family members via eWeLink APP.
INSTANT ALERTS - Receive notifications for temperature and humidity changes.
SEAMLESS INTEGRATION - Works flawlessly with Alexa and Google Home for voice control.
SMART CLIMATE CONTROL - Monitor and manage your indoor environment effortlessly.
EFFORTLESS INSTALLATION - Stick it anywhere with 3M adhesive for a clutter-free setup.

The SONOFF SNZB-02 is a cutting-edge ZigBee mini indoor temperature and humidity sensor designed to provide real-time climate feedback. Compatible with the SONOFF ZigBee Bridge, it allows seamless integration with smart home systems like Alexa and Google Home. With features like instant alerts, family sharing capabilities, and easy installation, this sensor is perfect for anyone looking to enhance their home environment.

Specifications

Manufacturer	SONOFF
Part number	SNZB-02
Item Weight	45 g
Product Dimensions	4.3 x 4.3 x 1.4 cm; 45 g
Item model number	SNZB-02
Size	SNZB-02 1Pack
Color	White
Material	PC(V0)
Power source type	Battery Powered
Item Package Quantity	1
Measurement Accuracy	±0.2°C/±0.4°F
Plug Profile	Wall Mount
Included components	SNZB-02
Batteries Included?	No
Battery Cell Type	Lithium Manganese Dioxide

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