Xiaomi · NUN4126GL

Xiaomi Mi Temperature and Humidity Monitor 2 (NUN4126GL)

Name: Xiaomi Mi Temperature and Humidity Monitor 2 (NUN4126GL)
Brand: Xiaomi
SKU: NUN4126GL
Price: 199 MDL
Availability: InStock

199 MDLIn stock

Temperature & humidity

Bluetooth

Manufacturer images

199 MDLIn stock

What it needs to work

It is added to Xiaomi Home from a phone over Bluetooth. Linking with other devices (automations) and Baby Mode work only through a device with Mi Bluetooth Gateway function (sold separately).

Suitable gateways and hubs

Buy with installation

Check compatibility

Display: LCD
Connectivity: Bluetooth LE

Reads room temperature and humidity on an LCD of about 28 × 28 mm, powered by a Sensirion sensor with Bluetooth sync to the Xiaomi Home app.

25 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

SKU: NUN4126GL · Document model: LYWSD03MMC

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

Measurement and detection9

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, 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.	Not stated by the manufacturer
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.	Not stated by the manufacturer
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.	0–60 °C [1]
Humidity measuring range — what it means The range over which the probe measures relative humidity (% RH). Not applicable to temperature-only probes.	0–99% [1]
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.	Not stated by the manufacturer
Temperature resolution	0.1 °C [1]
Humidity resolution	1% [1]
Sensing element	Sensirion digital temperature and humidity sensor [2]

Control and features3

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.	LCD [2]
Screen size — what it means The indoor screen's diagonal in inches (1″ = 2.54 cm). It decides how large the visitor appears and from how far away you can see them.	1.6″Xiaomi gives a 28 × 28 mm display and says "1.5-inch" is a display model designation, not a size; the ≈1.6″ diagonal is calculated from these dimensions [2]
Shown on the display — what it means Which data you can see on the scale itself, without a phone. All other metrics are available only in the app.	Temperature, Humidity, comfort indicator, battery levelComfort is a face icon (comfortable at 19–27 °C and 20–85%). The battery symbol appears only when low. A data-transfer symbol is shown. No clock or date [1]

Connectivity and compatibility6

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.	Bluetooth LEBluetooth 4.2 Low Energy, 2402–2480 MHz [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 optionalIt is added to Xiaomi Home from a phone over Bluetooth. Linking with other devices (automations) and Baby Mode work only through a device with Mi Bluetooth Gateway function (sold separately) [1]
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.	Not stated by the manufacturer
App — what it means The maker’s app used to set up and control the device.	Mi Home / Xiaomi Home [1]
Bluetooth version — what it means The Bluetooth version used for the remote, wireless headphones, speakers and gamepads. Newer versions hold the connection more steadily and use less power on connected devices.	Bluetooth 4.2 Low Energy [1]
Radio frequencies and transmit power	2402–2480 MHz, max 4.16 dBm [1]

Power3

Batteries or battery — what it means Which cells it takes and how many. A built-in rechargeable battery is stated in the value.	CR2032The mi.com Italy page says "installed"; the UK user manual (v1.3) says "not included, sold separately" [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.	12 monthsAbout one year of standby when not connected to the app; MiaoMiaoCe lab figure, varies with conditions [2]
Supply voltage — what it means The supply voltage (and current, if stated) as the maker gives it. It must match your mains or adapter.	2.5–3 V ⎓ (CR2032 battery) [1]

Housing and installation6

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.	Desk or shelf, Wall, adhesive tapeStands on a surface or sticks to a wall with the included adhesive; there is a lanyard hole (lanyard not included) [1]
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.	43 × 43 × 12.5 mm [1]
Weight — what it means The device’s weight without packaging, per the maker.	18 g [1]
Housing material	ABS and PMMA [1]
Certifications — what it means Standards and certifications the maker lists for this model (for example CE, RoHS, Zigbee 3.0, Matter).	CE (RED 2014/53/EU), UKCA; standard QB/WSDJ 2401–2019; CMIIT ID 2019DP8115Standard and CMIIT ID are from the mi.com page [3] [1]

Operating conditions1

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.	0–60 °CXiaomi states the device is not suitable for environments below 0 °C or above 60 °C [2]

Model and version1

Manufacturer variant	LYWSD03MMC [3]

Package contents1

Package contents — what it means What comes in the box, per the maker.	Monitor, wall adhesive sticker, user manual [3]

Manufacturer documents

Clear purchase details

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.

CasaSmart

We can handle installation.

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What it needs to work

It is added to Xiaomi Home from a phone over Bluetooth. Linking with other devices (automations) and Baby Mode work only through a device with Mi Bluetooth Gateway function (sold separately).

Xiaomi

Zigbee

Bluetooth

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Works without internet: Yes

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