YoLink Smart Wireless Thermometer Hygrometer 3-Pack — Long‑Range LoRa, Wide −4°F–129°F Range, 5‑Year Battery

Compact wireless sensors that monitor temperature and humidity across extreme ranges, send app/email/SMS alerts, and run for years on two AA batteries (Hub required).

YoLink’s Smart Wireless Thermometer Hygrometer 3-pack gives you continuous environmental data from places standard WiFi sensors struggle to reach. Using a long-range, low-power LoRa-based link instead of your home WiFi, these battery-powered sensors report temperature and humidity with commercial-grade accuracy and configurable alerts, so you can protect food, plants, pets and valuable possessions without crowding your network.

How reliable is the temperature and humidity data?

The sensors deliver precise readings across a broad span of conditions: temperature measurement from -4°F to 129°F (-20°C to 54°C) and full 0–100% relative humidity coverage. Accuracy is tight in typical ranges, and the device gives more conservative accuracy specs at extreme cold temperatures.

• Temperature accuracy: ±0.36°F (0–54°C), ±0.72°F (-20–0°C)
• Humidity accuracy: ±3% within 10–90% RH
• Measures down to -4°F and up to 129°F for freezer to greenhouse use
• Suitable for fridges, freezers, greenhouses, pet enclosures, and storage

What connectivity and alert options are available?

YoLink sensors connect through a YoLink Hub using a LoRa-derived protocol, which keeps your home WiFi free from extra traffic and extends sensor reach—up to about a quarter mile in open air. Alerts can be tailored in the YoLink app and delivered via push notifications, email, or SMS, with special options for iOS critical alerts.

• Requires a YoLink Hub for app reporting and remote alerts
• Set custom high/low thresholds and immediate notifications
• SMS is limited: hub + one sensor gives 15 free SMS per month; device SMS capped
• Integrates with IFTTT and responds to Alexa temperature queries

How long does the battery last and how is maintenance handled?

The sensors run on two AA batteries and are engineered for ultra-low power draw so the expected service life can reach up to five years depending on sample rate and environmental factors. The YoLink app alerts you in advance when battery replacement is needed, which keeps maintenance simple even for hard-to-reach placements.

• Powered by two AA batteries with up to 5 years typical life
• Low-battery push notifications through the YoLink app
• Ideal for vaulted ceilings, attics, freezers or exterior spots out of WiFi range
• Minimal upkeep: swap AAs when the app notifies you

Can these sensors be used with smart home services?

Yes — YoLink supports integration with IFTTT and limited Alexa functionality. You can trigger IFTTT applets when temperature thresholds are crossed and ask Alexa for current temperature readings, though Alexa routines and humidity voice queries are not supported at this time.

• IFTTT triggers available on high/low temperature alerts
• Ask Alexa the current temperature (humidity not available via Alexa)
• Routines via Alexa are not supported; check YoLink updates for changes
• Hub compatibility with multiple YoLink devices expands system capabilities

Who is this for: The YoLink 3-pack is aimed at homeowners, small business owners and hobbyists who need dependable environmental monitoring outside standard WiFi coverage. It’s especially useful for people monitoring freezers, fridges, greenhouses, pet habitats, storage units and remote rooms who want long battery life, reliable alerts, and minimal impact on their home network. Note: a YoLink Hub is required to use the app and remote notifications; the hub also enables SMS/IFTTT/Alexa integrations and supports other YoLink devices.