Sonoff · SNZB-02B

Sonoff SNZB-02B (AirGuard TH Lite) Zigbee temperature and humidity sensor, no display

Name: Sonoff SNZB-02B (AirGuard TH Lite) Zigbee temperature and humidity sensor, no display
Brand: Sonoff
SKU: 6979033600690
Price: 299 MDL
Availability: InStock

299 MDL3 left

Temperature & humidity

Zigbee

Manufacturer images

299 MDL3 left

What it needs to work

A compatible hub is required.

Suitable gateways and hubs

Buy with installation

Check compatibility

Temperature accuracy: 0.2 °C
Display: No display
Connectivity: Zigbee

A slim temperature (±0.2 °C) and humidity (±2 %) sensor for cabinets, display cases and tight spots; it does not measure pressure. Dew point and VPD in the app. Two AAA batteries, 66.3 × 27.8 × 20 mm body, Zigbee hub required.

28 specifications from manufacturer documents

We deliver across Moldova. Availability, delivery timing and cost are confirmed with a manager before order fulfilment.

The right choice starts with specifications

Device passport

Document model: SNZB-02B

Specifications checked against the linked manufacturer documents.Checked 18 October 2026

Measurement and detection7

Measured parameters — what it means Which values the monitor measures with its own sensors. Data the app pulls from the internet (such as outdoor air quality) is not included.	Temperature, HumidityDew point and VPD are calculated by the app from temperature and humidity [1]
Temperature accuracy — what it means Permitted error of the built-in sensor, ± °C. A value of 1 means that at 21 °C in the room the thermostat may show anything from 20 to 22 °C.	0.2 °CThe manufacturer does not state the range over which this accuracy applies [1]
Humidity accuracy — what it means The possible deviation of relative humidity readings (± % RH) according to the manufacturer. The smaller the number, the closer the readings are to reality; if accuracy differs across the range, the conditions are in the note.	2%The manufacturer does not state the range over which this accuracy applies [1]
Temperature measuring range — what it means The range over which the probe measures temperature. The upper limit matters for hot water, heating circuits or a sauna; the lower limit for a freezer or outdoors.	Not stated by the manufacturer
Humidity measuring range — what it means The range over which the probe measures relative humidity (% RH). Not applicable to temperature-only probes.	Not stated by the manufacturer
Data update interval — what it means How often the sensor measures or sends new values according to the manufacturer. Many models also report straight away when a value changes noticeably — the conditions are in the note.	5 sThe sensor refreshes its measurements every 5 s. How often data reaches the app depends on the reporting threshold and interval set in eWeLink (more frequent reports shorten battery life) [1]
Sensing element	Sensirion digital sensor (Switzerland) [1]

Control and features2

Display — what it means Whether the unit has its own screen with readings. With a screen you can see the temperature without a phone; without one, only in the app.	No displayThe manual calls it a screen-free sensor; there is only an LED indicator [2]
Values calculated in the app	Dew point and VPD (vapour pressure deficit)Calculated from temperature and humidity; up to 6 months of history with CSV export when used with a SONOFF gateway [3]

Connectivity and compatibility7

Connectivity — what it means The wireless link or network the device uses. Wi-Fi connects straight to the router; Zigbee, Thread and Bluetooth Mesh work through a hub or gateway.	ZigbeeZigbee 3.0 (IEEE 802.15.4) [1]
Hub required — what it means Whether the device needs a separate hub, gateway or coordinator to work in a smart home. If so, it is sold separately unless stated otherwise.	Hub requiredThe manufacturer states a Zigbee gateway is required: SONOFF ZBBridge-P, ZBBridge-U, NSPanel Pro, iHost, SONOFF USB coordinators or third-party Zigbee 3.0 gateways (SmartThings Hub V3, Amazon Echo with Zigbee). Without a gateway no readings reach the app [2]
Home Assistant — what it means How the device connects to Home Assistant: a built-in integration, a Zigbee coordinator, Matter or the maker’s cloud integration.	Via a Zigbee coordinator / hubThe manufacturer lists Home Assistant through ZHA or Zigbee2MQTT with a Zigbee coordinator (ZBDongle-P/-E etc.). ZHA currently needs a script (quirk) from the SONOFF website [3]
App — what it means The maker’s app used to set up and control the device.	eWeLinkThrough a SONOFF gateway; with other brands' gateways, in their own apps. Alexa, Google Home and SmartThings get readings through eWeLink cloud account linking [2]
Processor / radio chip — what it means The microcontroller or radio module inside, per the maker (for example ESP32). For firmware such as WLED and ESPHome it determines available features and whether the device can be re-flashed.	Telink TLSR8656 [1]
Radio frequencies and transmit power	Zigbee 2405–2480 MHz [2]
Transmit power — what it means The coordinator's maximum radio output. Higher power gives a steadier link to distant devices, but range in a home depends more on walls and the number of routers in the network.	≤ 10 dBm (EU) [2]

Power4

Batteries or battery — what it means Which cells it takes and how many. A built-in rechargeable battery is stated in the value.	2 × AAA (LR03)Tool-free replacement according to the product page [1]
Battery life — what it means Typical life on one set of batteries or one charge, per the maker. Frequent triggers, cold and a weak signal shorten it.	24 months“Up to 2 years” — a SONOFF lab value; depends on reporting frequency and the link quality to the gateway [1]
Supply voltage — what it means The supply voltage (and current, if stated) as the maker gives it. It must match your mains or adapter.	3.0 V ⎓ (2 × 1.5 V) [1]
Power source — what it means Where the device gets its power: 230 V mains, an adapter, USB, batteries or a built-in battery.	Batteries [1]

Housing and installation7

Ingress protection (IP) — what it means Protection against dust (first digit) and water (second). IP20 is for dry rooms only, IP44 resists splashes, IP65 and up handle water jets and outdoor use.	Not stated by the manufacturer
Mounting — what it means How and where it is installed: in a wall box, on a wall or ceiling, on a DIN rail, on a table or in a socket.	Adhesive tape, desk or shelfIt can hang from its lanyard, be stuck to a wall with 3M tape or simply be placed down. Mounting height no more than 2 m [2]
Dimensions — what it means The device’s size in millimetres as the maker states it. Check that it fits the wall box, niche or shelf.	66.3 × 27.8 × 20 mm [1]
Weight — what it means The device’s weight without packaging, per the maker.	43 gIncluding batteries [1]
Housing material	PC [1]
Certifications — what it means Standards and certifications the maker lists for this model (for example CE, RoHS, Zigbee 3.0, Matter).	CE, FCC, RoHS [1]
Mounting height	2 mNo higher than 2 m according to the manual [2]

Operating conditions2

Operating temperature — what it means The air temperature range the device is rated for. The lower limit matters outdoors, on balconies and in unheated rooms.	−20…60 °C [1]
Operating humidity — what it means The rated relative humidity range, non-condensing.	5–95%Non-condensing [1]

Model and version1

Colour — what it means The housing colour of this model. Other colours in the same series are separate products.	White [1]

Package contents1

Manufacturer warranty — what it means The warranty period the maker states. Confirm warranty terms in Moldova with the seller.	24 months“2-Year Hassle-Free Warranty” on the official SONOFF store page; the regional seller’s terms may differ [1]

Manufacturer documents

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Delivery and stock

We deliver across Moldova. Availability, delivery timing and cost are confirmed with a manager before order fulfilment.

How is payment handled?

A website order is submitted for confirmation without charging your card. The payment method and final amount are agreed with a manager before payment.

Warranty and documents

The warranty is at least 12 months. The exact period and conditions for equipment and installation work are stated in the sales documents and the accepted proposal. Further support is agreed for each project.

Can I return the product?

Current conditions are published on the Return policy page. Email office@casasmart.md with your order number for the steps relevant to your situation. Statutory consumer rights continue to apply.

Delivery, payment and returns

In your home

First detect it. Then trigger the right routine.

A sensor reports measurements or events. What happens next depends on configuration and separate control devices.

See the complete solution

A hand adjusts a wall thermostat in a living room with a radiator — An example routineEach room has its own temperature.

What to check before buying

This is a sensor: it reports measurements. Heating adjustment needs separate actuators and a control routine.
Power — Batteries: plan it for the mounting spot.

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