From the brand
Package Dimensions : 7.17 x 6.38 x 1.22 inches; 13.44 ounces
Item model number : YS1603-UC+YS8003-UC*2
Batteries : 4 AAA batteries required. (included)
Date First Available : September 22, 2020
Manufacturer : YoSmart
ASIN : B08JP39RLP
Best Sellers Rank: #1,123 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #14 in Indoor Thermometers #37 in Home Automation Devices
Customer Reviews: 4.5 4.5 out of 5 stars 4,033 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
LONG-RANGE, LOW-POWER: LoRa sensors reach up to 1/4 mile in open air, far beyond WiFi & Zigbee. Up to 2 years of battery life—reliable even in basements, barns, and metal enclosures.
PROTECT WHAT MATTERS: Keep wine at the right temp, monitor your child’s nursery, ensure pets stay comfortable, or track humidity in greenhouses, RVs, and bedrooms. *Not for outdoor use.
EASY SETUP & INTEGRATIONS: Plug in the Hub via Ethernet/2.4 GHz WiFi, scan QR codes to add devices instantly. Compatible with Alexa (temperature only) and IFTTT applets.
ECONOMICAL SMART UPGRADE: Make any indoor space smarter. Start with temperature sensors, then expand with YoLink door, leak, and power sensors for complete protection.
ALERTS YOUR WAY: Get push notifications, emails, or SMS (incl. iOS Critical Alerts that bypass silent mode). Each Hub with two sensors includes 20 free SMS per month.
David D. –
I studied all the systems out there, THIS is the one you want
I use this inside my dual walk in cooler and freezer. What sets this apart from other similar temp monitors is that you don’t need to run a wire out the door to transmit to the base. The signal can travel through the aluminum cooler box walls. It’s been running without any issues for many months now, so amazing battery life. Installation and setup was a breeze. The app works great and shows 24 hours history. It can be set to alert via SMS text. No monthly service either. Temp reading seems accurate since they match up to the cooler gauges. When you have thousands of $s in food product at risk, you need 24×7 monitoring. Great value and small price to pay for peace of mind.
a boyles –
Can’t beat the quality, price, performance
In my experience the YoLink Temperature and Humidity Sensors have been an extremely easy to install and configure and a very reliable product. I purchased my first three sensors at my home in Canada to monitor my deep freeze, my refrigerator and my kitchen air temperature and humidity. I installed them 2025-06-10 and as of today 2025-10-13 they have been in service for 4 mon 3 days. I used Amazon Basics Alkaline batteries and after 4 months all are at 100% charge! The product interface is extremely intuitive and the product provides a plethora of data with the option to download MS Excel or CSV history files for the past three months.The station hub is the “control center and brains” of the service through and to which the sensors communicate to the hub and to the internet.I now added my USA condo to its own hub with three sensors for deep freeze, refrigerator and family room and it is all configured under a second home in the YoLink software.It’s EXACTLY the product I wanted and it lacks nothing. It’s been designed beautifully and the product itself is flawless and an engineering work of quality.This is an exceptionally intuitive, capable, flexible and reliable product. It should be in your toolkit for home automation for properties outside your driving range.An exceptional product and as a design engineer myself, It’s well done, especially for the extremely reasonable price.
Scott C. –
Great Product – Saved Food
Have sensor in garage fridge and main fridge in kitchen and hub reaches both easily. APP great to alert of issue, and has saved contents from a door not being fully closed AND in another case helped alert of a fan failure. More than paid for itself. Being able to monitor history of temperature and humidity is another really nice feature of APP. Battery life has been amazing and local displays nice to see when I open door and see status. Would recommend to anyone concerned about a refrigerator or freezer that might not hold temperature, isn’t used frequently, or is used by many people who might not always close doors completely … basically anyone who has a refrigerator or freezer. I won’t own another refrigerator or freezer without one.
John –
Peace of Mind in My Freezer
The smart wireless temperature and humidity sensor has been a fantastic addition to my setup. I’m using it to monitor both my freezer and a pet area, and it works flawlessly for both. The readings are accurate, update quickly, and give me peace of mind knowing everything is at the right levels.The wide temperature range is a huge plus—it handles the deep freeze just as easily as regular room conditions. I love being able to check the data remotely through the app; no more guessing or manually opening the fridge/freezer to check.Setup was straightforward, and the wireless connection has been reliable without drops. The sensor is compact and easy to place wherever you need it, and the alerts are customizable, so I know right away if something goes out of range.Whether for food safety, pet comfort, or just keeping an eye on indoor conditions, this sensor is an affordable and dependable solution. Highly recommend for anyone who wants accurate monitoring with smart convenience.
YubiK –
Battery Lasted only 8 months before I had to replace
Great at first, I had a mishap with the freezer and lost almost all my meat.This thermometer alerts me if temperatures changes or fluctuates too much the problem is that I got in in August and is beginning of April and already doesn’t work. Battery is dead.8 months and dead. I got the 2 year battery one.Very disappointed* updated reviewI try changing battery and couldn’t so I wrote the one star review, later figure out how to change batteries and just installed new ones, regular batteries that don’t last long in the fridge but my thermostat still works and sends me alerts. So helpful to not have to throw away a full freezer of beef.Customer service said they were going to send me a new one and never did so they don’t follow thru but still the product works.
Travis Green –
Fridge & Freezer Temp Monitors
Bought a set in March 2025. It included two temperature & humidity sensors and the hub required to use them. Setup was a breeze. Both devices connected easily and have never lost their connection. One is in my kitchen fridge and the other is in my garage freezer. We had our fridge go out last year and didn’t know it until some items had already got too warm. These monitor the temp and will alert me when the temperatures get above a certain limit. I chose the limit and set it in the app. They work great and I couldn’t recommend them any higher. I’m looking to get other YoLink devices to use with the hub.
Bailey Drollinger –
Great buy for breastmilk freezer!
Super easy to set up. App is easy to use. Works great and sends me a notification to my phone if the temp in my freezer gets low (adjustable thresholds). Highly recommend especially for breastmilk freezers!
BC –
Priced right reliable and easy to set-up
These have worked perfectly and priced so well. I compared to other solutions that were more expensive and wifi. The Wifi range was poor and battery life not good at all.The app is simple and reliable. I plan to add water sensors as well
Vegetarian Aardvark –
Yolink products are the best smart home devices that I own. Reliable, accurate and have long connection range. The batteries last for an extremely long time, unlike claims from other smart home devices and cameras.Easily attaches to Home Assistant my main smart home brain. Also attaches to standards devices such as Alexa and Google.
Stephan Gruber –
Grundsätzlich funktioniert das Produkt sicher gut aber das Problem ist das es aus Amerika kommt und über den US Server läuft.Zusätzliche Geräte bekommt man nur sehr schwer über die Amerikanische Seite und dort wuchern die Preise wegen des Versandes + Zollgebühren.Ein anderer Anbieter aus England auf Amazon hat nur Sensor ohne Hub verkauft, hab den dann aber nicht mit diesen Hub verbinden können, da der Sensor Plötzlich eine andere Typennummer hatte, und der dann auf dem EU Server laufen sollte.Für EU habe ich aber keinen anderen Anbieter mehr gefunden und schließlich alles wieder zurück geschickt.
J James –
The hub is an absolute pig to set up but once you have done then it’s a great piece of kit for ensuring that I’m notified if the freezer out in the garage fails. I’m using the other sensor to keep an eye on the temperature in the freezer in the house.* important to note that it will initially tell you that no internet has been found – just ignore it and carry on with the set up*
Andrew Cogram –
3 Temp sensors installed, 2 in freezers and 1 in fridge ,set temp limits, set alarm low/ high, hey presto alarm speaks through hub + app notification, lora much better than WiFi. Best thing purchased for a long time. 😃
max_ex –
Man Brauch ein hub das es geht sind erneute 150€ kosten , sehr unnötig