U UNNI Wireless Thermometer Hygrometer with 3 Sensors

The U UNNI wireless thermometer hygrometer uses three sensors to display temperature and humidity readings for indoor and outdoor locations. Its 4.5-inch display, adjustable backlight, and high/low alerts suit home monitoring, while the listed temperature and humidity accuracy limits matter if you need tighter measurement tolerances.

At a glance

Displays temperature and humidity data from three sensors, with updates stated every 30 seconds.
High/low outdoor temperature and humidity alerts, comfort indicator, trends, and daily maximum/minimum records are listed.
USB power keeps the backlight on, three brightness settings are listed.
The display supports tabletop or wall placement.

Price

$25.98Save 13%

Reference price: ~~$29.99~~

Price checked: Nov 11, 2026

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Pros and cons

Pros

Three sensors support monitoring several locations from one display.
The product lists both outdoor alerts and indoor/outdoor humidity readings.
USB or battery power provides two stated power options.

Cons

The listed temperature accuracy is +/-2ºF and humidity accuracy is +/-5%, which may not suit applications requiring tighter tolerances.

Technical specifications

18 specifications

Identity
Brand	U UNNI

Connectivity and controls
Wireless connection listed	Radio Freqeuncy
Sensors	3 sensors
Update interval	every 30 seconds
Transmission distance	330 ft radius
Temperature units	°C &°F

Measurement
Indoor temperature range	14.2ºF ~ 122ºF
Outdoor temperature range	-40ºF to 158ºF
Indoor/outdoor humidity range	20%~95%
Temperature accuracy	+/-2ºF
Humidity accuracy	+/-5%

Display and features
Display size	4.5 inch
Backlight settings	3 kinds of brightness(high-low-off)
Maximum/minimum records	All MAX / MIN temperature/humidity records will reset automatically every 24h.

Power and battery
Power configuration	Usb+battery Powered
USB backlight operation	Plug into the USB cable, which will keep the backlight on

Dimensions and installation
Dimensions listed	3.94"D x 3.94"W x 3.94"H
Installation options	tabletop or wall-mountable

What to know before buying

Listing details to confirm

The listing states the sensors transmit up to 330 ft radius, while another feature line says 328FT/100M, these distance claims differ. The product title calls the alerts high/low temperature and humidity alerts, while the feature text specifies outdoor alerts. Check which alert functions apply to your intended setup.

What’s in the box

User manualIncluded
Display screenCheck selected pack
3 outdoor sensorsCheck selected pack
USB cableCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

Home users who want a central display for temperature and humidity across multiple indoor or outdoor locations.
Buyers who want outdoor readings, alerts, and adjustable display lighting.

Less suited to

Users who need measurement accuracy tighter than the listed +/-2ºF temperature and +/-5% humidity tolerances.
Buyers who require a confirmed transmission distance or alert behavior beyond the stated listing details.

U UNNI Wireless Thermometer Hygrometer with 3 Sensors · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 7,536 ratings

5 stars74%74%
4 stars12%12%
3 stars6%6%
2 stars2%2%
1 star6%6%

The supplied aggregate rating is 4.4 out of 5 stars, but no rating count or qualitative customer feedback is provided. The score alone does not establish what buyers liked or disliked, for a multi-location monitor, the listed accuracy limits and the differing transmission-distance statements are relevant details to weigh.

Frequently asked questions

Can the display monitor more than one location?

The listing says it displays data from three sensors and describes indoor and outdoor monitoring. It does not specify whether every channel is visible simultaneously.

How often are readings transmitted?

The feature text states that temperature and humidity data update and transmit every 30 seconds.

What are the stated measurement limits?

The listing gives an indoor temperature range of 14.2ºF ~ 122ºF, an outdoor range of -40ºF to 158ºF, indoor/outdoor humidity of 20%~95%, and stated accuracies of +/-2ºF and +/-5% humidity.

Does it need to stay connected to USB?

The listing says it can run on USB or batteries, USB keeps the backlight on. It does not specify battery life.