Introduction
Zigbee Temperature and Humidity Sensor
User Manual V1.0
AirGuard TH is a smart temperature and humidity sensor supporting both Zigbee and Bluetooth connections. It features a large high-definition LCD screen that displays real-time local temperature and humidity data, daily highs and lows, and remote readings—all at a glance, making it an ideal choice for home environment monitoring. When connected to a phone via Bluetooth, the app allows real-time tracking of temperature changes, viewing of historical statistics, and dew point data for intuitive and convenient monitoring. When paired with a Zigbee gateway, it supports remote data access, remote temperature and humidity source setup, and smart home scene automation for an enhanced experience.
App Monitoring
3.6″ Large Display
Smart Scenes
Dew Point
Measurement
Remote Data
Comparison
Dual-Mode
Connectivity
① Bluetooth signal icon
- Keeps on: Bluetooth mode pairing successful
② Zigbee signal icon
- Flashes slowly: Device is in pairing mode
- Keeps on: Zigbee mode pairing successful
③ Battery
④ Current temperature
⑤ Max/Min temperature of the day
⑥ Current humidity
⑦ Max/Min humidity of the day
⑧ Hanging hole
⑨ Button
- Single press: Device wake-up/Reconnection
- Double-press: Switch temperature unit ℃/℉ (Factory default is ℃)
- Press and hold for 5 seconds: Device enters the pairing mode (Pairing time 180s）
⑩ Stand
Specification
Download the eWeLink App
Please download the “eWeLink” App from Google Play Store or Apple App Store.
Power on the device
Take out the battery insulation sheet to power on the device.
Take out the battery insulation sheet to power on the device.
When the device is used for the first time, it will enter pairing mode by default after being powered on, and the signal icon 
is in a “slow flashing state”.
The device will exit the pairing mode if not paired within 3 minutes. When you want to enter the pairing mode again, long-press the button on the device for 5 seconds until the signal icon “flashes slowly” and release.
Add Device
Method 1 : Zigbee Pairing (Suggested)
① Add SONOFF Zigbee gateway
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Matched Gateways |
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Recommended SONOFF gateway models: |
ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost |
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Other compatible SONOFF gateway models: |
ZBDongle-P, ZBDongle-E, Dongle-M, Dongle-PMG24, Dongle-LMG21 |
② Add device
Enter “Scan”
Scan the QR code of the device
Select “Add Device”
(If the device exits pairing mode)
Long press the button for 5 seconds
Check the signal icon flashing status (Slow flash)
Select Zigbee gateway.
Wait until the addition is done.
Method 2 : Bluetooth Pairing
Enter “Scan”
Scan the QR code on the device
Select “Add Device”
(If the device exits pairing mode)
Long press the button for 5 seconds
Check the signal icon flashing status (Slow flash)
Tap “Next”
Choose the device and tap “connect”
When connected to the Zigbee gateway, the eWeLink App offers full features, including remote access, smart scenes, and notifications.
Without a Zigbee gateway, when the device is connected directly to the phone, the eWeLink App supports basic functions such as data viewing locally.
Installation Methods
Open the stand to place the device on a tabletop.
Use screws to hang the device on the wall.
How to use the Remote Temp. & Humi. Display
Select “Remote Temp. & Humi. Display”on device setting page.
Turn on the switch and choose the device to be used as the remote temperature source.
Tap “Save” in the upper-right corner, then press the device button as prompted to confirm.
Once successfully set, remote data will appear on both the display and the App.
To cancel remote Temp. & Humi. display: turn off the switch, then press the device button to save the settings.
Both the display device and the device used as the remote Temp. & Humi. source must be added under the same SONOFF Zigbee gateway.
Supported SONOFF sensors for remote Temp. & Humi. source: SNZB-02, SNZB-02P, SNZB-02D, SNZB-02WD, SNZB-02LD.
Supported SONOFF gateways for remote Temp. & Humi. source function: ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost.
To use this feature, please upgrade the device firmware to version 1.1.0 or above.
Replace the Battery
Remove the battery cover to replace the batteries.
When replacing, use batteries of the same type.
Factory Reset
Press and hold the device button, then power it on. The device will be restored to factory settings.