Smart indoor temperature and humidity sensor Sonoff SNZB-02DR2 with monitoring function | 3.6'' LCD display | VPD (Vapor Pressure Deficit) and dew point analysis | Zigbee 3.0

Technical specifications

Communication protocol: Zigbee (IEEE 802.15.4)
Display: 3,6'' LCD (large, clear)
Measurements: temperature, relative humidity
Additional analysis: dew point, VPD curves
Operating temperature: −20 °C ~ +60 °C
Operating humidity: 5 % ~ 95 % RH (non-condensing)
Housing material: PC + ABS
Dimensions: 95 × 70 × 18,2 mm
Net weight: 99,3 g (with battery)
Mounting: tabletop / wall-mounted
Compatibility: Zigbee hub (e.g., Sonoff Zigbee Bridge, other Zigbee 3.0)

Functions

Temperature measurement – measures indoor air temperature in real time and displays it on the LCD screen and in the app
Humidity measurement – monitors relative humidity (%), helps maintain comfort and avoid excessive humidity or dryness
VPD (vapor pressure deficit) analysis – indicates whether the air is too dry, too humid, or optimal for the indoor microclimate
Dew point calculation – helps assess the risk of condensation and mold formation
3.6'' LCD display – all key data visible at a glance, without a phone
Data history in the app – view measurement graphs and changes over time
Zigbee 3.0 connectivity – stable, energy-efficient connection with a smart home system
Automation capabilities – create scenarios (e.g., turn on a humidifier or ventilation when set thresholds are reached)
Voice control – compatible with Alexa, Google Home, and SmartThings 

Usage

For household users: Home, children’s rooms, bedroom microclimate, mold prevention and comfort, simple climate monitoring without complex settings
For electricians / installers: Fast Zigbee integration, reliable, low-power solution, suitable for smart home projects
For engineers / electricians: Data-based climate analysis, monitoring of multiple rooms on one screen, additional information (VPD, dew point)

Pros

Large 3,6'' LCD – everything visible at once
Temperature, humidity + dew point and VPD analysis
Zigbee – stable, low-power connection
Data history and graphs
Voice control
Ability to display data from other sensors

Cons

Requires a Zigbee gateway (hub)
For indoor use only
Does not control devices directly – used via automations