Xiaomi Smart Temperature and Humidity Monitor 3 Mini: Global version of the compact smart home sensor with up to 3 years battery life

On June 14, 2025, Xiaomi introduced the global version of its Smart Temperature and Humidity Monitor 3 Mini — a compact and affordable indoor climate sensor designed for smart homes. Combining precision, long battery life, and seamless integration with Xiaomi’s ecosystem, the device is priced at €14.99 in Europe and aims to provide a convenient and eco-conscious solution for maintaining comfort indoors. Here’s everything you need to know.

Compact Design and Display

The Monitor 3 Mini stands out with its small size and lightweight build:

• Dimensions: 53.0 x 45.3 x 13.0 mm
• Weight: Only 30g — nearly half the size and weight of the original Monitor 3 (79.6 x 70.2 x 14.5 mm, 72g).
• Display: 2.1-inch LCD with ultra-thin bezels (5.1 mm) and high screen-to-body ratio, showing both temperature and humidity data refreshed every 6 seconds.
• Material: Durable ABS plastic (not water-resistant).
• Mounting: Comes with adhesive for wall placement; stand not included (unlike the standard Monitor 3).

Highlight: A simple smiley face indicator quickly shows whether the indoor climate is within recommended comfort ranges (19–27°C, 20–85% RH).

High Accuracy and Smart Features

The device includes a Swiss-made Sensirion sensor, providing precise readings:

• Temperature Range: 0–60°C with ±0.1°C accuracy
• Humidity Range: 0–99% RH with ±1% accuracy

Functionality:

• Local Storage: Up to 3 months of onboard data
• Cloud Storage: Up to 6 months via the Xiaomi Home app (Bluetooth Mesh gateway required)
• Graph View: View temperature and humidity history by hour, day, or month in the app
• Automation: Can control other smart devices (e.g., fans, humidifiers) based on climate triggers

Connectivity:

• Bluetooth Low Energy 5.0
• Standard mode updates every 1–5 minutes
• Power-saving mode updates every 3–13 minutes

Battery Life Up to 3 Years

• Battery: CR2450 coin cell (pre-installed)
• Lifespan:
• ~2 years in standard mode
• ~3 years in power-saving mode (battery icon shown on screen)
• Power Efficiency: Despite a slightly higher power draw (51 mW vs. 45 mW in Monitor 3), optimized design ensures long battery life
• Note: Device lasts longer if not connected to the app continuously

Smart Home Integration

Full functionality requires a Bluetooth Mesh gateway (e.g., Xiaomi Gateway):

• Automation Scenarios: Set up in Xiaomi Home app (v10+)
• Example: Turn on humidifier when RH drops below 40%
• Example: Turn on fan if temperature exceeds 27°C
• Voice Control:
• Chinese version supports Xiao AI
• Global version may support Google Assistant or Alexa via gateway
• Without Gateway: Functions as a standalone sensor with real-time data display

Price and Availability

• Price: €14.99
• Release Date: Global rollout begins in late June 2025
• Regions: Available in Europe (Germany, UK), Turkey, and Thailand
• Russia: No official launch; import possible via resellers (20–30% markup expected)
• Package Includes: Sensor, pre-installed CR2450 battery, adhesive strip, manual

Comparison with Competitors

Summary: The Monitor 3 Mini excels in compactness, precision, and battery efficiency, though it lacks the standalone cloud functionality of Govee.

Outlook

With this device, Xiaomi strengthens its position in the smart home market, delivering premium functionality at a low cost. The Monitor 3 Mini is ideal for:

• Children’s rooms: Comfort and health tracking
• Living/working spaces: Automation support
• Travel use: Lightweight and portable

Limitations:

• Gateway required for automation and cloud sync (~€30 additional cost)
• No water resistance (not suitable for bathrooms or kitchens)
• Limited availability outside of Europe

Sales Forecast: Expected to sell ~500,000 units in 2025 due to affordability and Xiaomi ecosystem popularity.

Conclusion

The Xiaomi Smart Temperature and Humidity Monitor 3 Mini is a compact, highly accurate climate sensor with up to 3 years of battery life and robust smart home features — all for just €14.99. Despite a few trade-offs (gateway dependency, no waterproofing), it’s a standout choice for users looking to maintain indoor comfort in an energy-efficient and eco-conscious way. The global launch in June 2025 will show whether the Mini lives up to its big potential.