The SONOFF AirGuard E-Ink (SNZB-02UL) is a Zigbee temperature and humidity sensor from the SONOFF AirGuard Series with a 2.9-inch E-Ink display. Its nearly 180° viewing angle keeps readings clear even in bright places such as sunrooms and balconies.
Once paired, the screen shows temperature, humidity, time, date, weather and a comfort indicator. Press the button to see the last 6 hours of readings without a gateway or app, and view readings from other compatible sensors on the same screen. It runs on 2 AAA batteries for 8+ months with a gateway, or 15+ months standalone.
Note: time, date, weather, remote readings and app features need a SONOFF Zigbee gateway or Home Assistant (see "Works With" below).
Key Features
2.9" E-Ink display with a nearly 180° viewing angle, clear in bright light
Shows temperature, humidity, time, date, weather and a comfort indicator
6-hour data recall on the screen at the press of a button, no gateway or app needed
High accuracy: ±0.2°C / ±0.4°F and ±2% RH, with data refreshed every 5 seconds
Remote Temperature & Humidity Source: view readings from other rooms on one screen
Smart alerts and automations, including heating control based on real room temperature
6 months of environmental data in the app
2 × AAA batteries: 8+ months with a gateway, 15+ months standalone
4 placement options: desktop, built-in magnet, wall mounting or adhesive backing
Works with Alexa and Google voice assistants, Apple Home via a Matter bridge, Home Assistant and Zigbee2MQTT
Works With
SONOFF Zigbee gateways: Bridge Max, ZBBridge-P, ZBBridge-U, NSPanel Pro 120 and NSPanel Pro 86 (also iHost)
Home Assistant (ZHA / Zigbee2MQTT): ZBDongle-P or ZBDongle-E
Apple Home: through a Matter bridge such as Bridge Max
Technical Specifications
Specification
Details
Model
SNZB-02UL
Product Series
AirGuard Series
Product Name
Zigbee Temperature Humidity Sensor
Wireless Protocol
Zigbee (IEEE 802.15.4)
MCU
TLSR8258
Display
2.9" E-Ink
Power Input
3.0V ⎓ (2 × 1.5V LR03 AAA batteries)
Battery Life
8+ months with gateway, 15+ months standalone
Temperature Accuracy
±0.2°C / ±0.4°F
Humidity Accuracy
±2% RH
Working Temperature
0°C ~ 50°C
Working Humidity
5% ~ 95% RH, non-condensing
Application Environment
Indoor
Casing Material
PC
Color
White
Dimensions
99.1 × 51.1 × 18.6 mm
Net Weight
91.0 g (including batteries)
Certifications
CE, FCC, RoHS
Why Choose the SONOFF SNZB-02UL?
A paper-like E-Ink screen that stays readable in bright sunlight
Check the last 6 hours without opening an app
See the climate of several rooms on one screen
Long battery life on standard AAA batteries
Downloads
⬇ Download User Manual (PDF)
Warranty: 12-month warranty from the Official Distributor.
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