Does the SNZB-02WD need a SONOFF hub to work with Edge?

No. It is a Zigbee 3.0 device, so it joins the Zigbee radio on an EpiSensor Gateway directly, and Edge reads it on the Gateway without a SONOFF hub or the eWeLink app.

Can it be used outdoors?

Only under cover. The IP65 housing handles humid and splash-prone places, but SONOFF says not to submerge it, spray it with high-pressure water or leave it where rain can reach it.

How long does the battery last?

SONOFF estimates over two years from the CR2477 cell with the default reporting settings. Cold shortens it: near -20 °C the battery capacity drops significantly and may not fully recover. Edge reports both battery level and voltage.

How far can it be from the Gateway?

SONOFF recommends no more than 50 m through walls. If it drops off the network, move it or the Gateway, or add a mains-powered Zigbee router in between.

SONOFF SNZB-02WD Zigbee IP65 temperature and humidity sensor

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 7 values from it, listed under Interface.

Connect it with

Gateway ZGW-20
From €899 ex VAT Configure Gateway

Specifications

Its housing is rated IP65 and has an internal waterproof, breathable membrane, so the humidity sensor sees the air while splashes stay out. It works from -20 to 60 °C and 0 to 100 % RH. That suits damp rooms, unheated stores, basements and greenhouses. SONOFF limits IP65 to splash-prone places: do not submerge it, aim high-pressure water at it or leave it outdoors where rain can reach it.^1, 2

Power: Battery. One 3 V CR2477 coin cell, estimated by SONOFF at over two years with the default reporting settings.¹
Temperature accuracy: ±0.2 °C¹
Humidity accuracy: ±2 % RH¹
Operating temperature: -20 to 60 °C¹
Operating humidity: 0 to 100 % RH¹
Ingress protection: IP65, with an internal breathable membrane¹
Display: 2.2-inch LCD¹
Wireless: Zigbee 3.0 (IEEE 802.15.4)¹
Microcontroller: TLSR8656F512ET32¹
Dimensions: 62.8 × 58.5 × 21.8 mm¹
Weight: 65.6 g¹
Enclosure: PC and ABS¹
Operating altitude: Up to 2000 m¹
Certification: CE, FCC, ISED, RoHS¹
Calibration offsets: -50 to 50 °C and -50 to 50 % RH, in 0.1 steps³
Firmware updates: Over the air³

Where it is used

Rooms where humidity is the problem, such as bathrooms and underground stores, which SONOFF names as uses.
Indoor environmental monitoring
Unheated stores and chilled rooms down to -20 °C. It is not rated below that, and its error grows as it approaches the limit.
Cold room and cold store temperature monitoring
Greenhouses and covered growing areas, where daily temperature and humidity records matter and splashes are likely.

Interface

Readings and settings, with units and ranges where SONOFF publishes them. readable, readable and writable.^1, 3

Download

Reading	Unit	Range or values	Access
Measurements 2
TemperatureAir temperature. The range is the sensor’s operating range.	°C	-20 to 60 °C	Read only
Relative humidityRelative humidity of the air.	%	0 to 100 %	Read only
Settings 3
Display unitThe unit shown on the sensor’s screen. Readings reach Edge in °C either way.	-	`celsiusfahrenheit`	Read and write
Temperature offsetAdded to each temperature the sensor reports, in 0.1 °C steps.	°C	-50 to 50 °C	Read and write
Humidity offsetAdded to each humidity value the sensor reports, in 0.1 % steps.	%	-50 to 50 %	Read and write
Diagnostics 2
BatteryRemaining battery charge.	%	0 to 100 %	Read only
Battery voltageVoltage of the coin cell.	mV	-	Read only

The display unit and both calibration offsets are settings held on the sensor. Press the button on the back to wake it before you change them from Edge.³

Setup

Open pairing in Edge
In Edge, open pairing on the Gateway’s Zigbee network. The Gateway accepts new devices while pairing is open.
Power it on
Twist off the battery cover with a coin and pull out the battery insulation sheet. On its first power-up the sensor enters pairing mode by itself and the signal icon flashes slowly.¹
Or start pairing by hand
The sensor leaves pairing mode after 3 minutes. To start again, press and hold the button with a card pin for 5 seconds until the signal icon flashes slowly. This also restores its factory settings.¹
Confirm the join
The signal icon stays on when the sensor has joined and goes off if pairing failed. Check that Edge identifies it as SONOFF SNZB-02WD.¹
Check one reading
Compare temperature and humidity with a reference instrument placed beside it. If they differ, set the calibration offsets from Edge before you rely on the data.

Common questions

Does the SNZB-02WD need a SONOFF hub to work with Edge?: No. It is a Zigbee 3.0 device, so it joins the Zigbee radio on an EpiSensor Gateway directly, and Edge reads it on the Gateway without a SONOFF hub or the eWeLink app.²
Can it be used outdoors?: Only under cover. The IP65 housing handles humid and splash-prone places, but SONOFF says not to submerge it, spray it with high-pressure water or leave it where rain can reach it.²
How long does the battery last?: SONOFF estimates over two years from the CR2477 cell with the default reporting settings. Cold shortens it: near -20 °C the battery capacity drops significantly and may not fully recover. Edge reports both battery level and voltage.¹
How far can it be from the Gateway?: SONOFF recommends no more than 50 m through walls. If it drops off the network, move it or the Gateway, or add a mains-powered Zigbee router in between.¹