Xiaomi · MJTZC01YM

Xiaomi Body Composition Scale S400 (White)

Name: Xiaomi Body Composition Scale S400 (White)
Brand: Xiaomi
SKU: BHR7793GL
Price: 499 MDL
Availability: InStock

499 MDLIn stock

Smart scales

Bluetooth

Manufacturer images

499 MDLIn stock

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Number of metrics: 25
Maximum capacity: 150 kg
Connectivity: Bluetooth LE

Reads 25 metrics — weight, body composition and heart rate — and syncs everything to the Xiaomi Home app over Bluetooth for up to 36 profiles.

35 specifications from manufacturer documents

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The right choice starts with specifications

Device passport

SKU: BHR7793GL · Document model: MJTZC01YM

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

Control and features13

What the scale measures — what it means Basic smart scales measure weight only (the app calculates BMI from the height in your profile). Body composition scales also pass a weak, safe current through the body and estimate fat, muscle, water and other metrics from its resistance.	Weight and body compositionDual-frequency bioelectrical impedance: weight and body composition [1]
User profiles — what it means How many family members can be added in the app, each with their own measurement history.	361 main Xiaomi account + up to 5 shared accounts; each of the 6 accounts can create 5 virtual users [1]
Automatic user recognition — what it means Whether the scale recognises who stepped on by weight and body resistance, without picking a profile manually. If two people have a similar weight, the app may ask to confirm the profile.	YesUsers whose weights are within ±2 kg of each other are not recognised automatically and must be selected in the app; offline body composition measurement is not available for them [1]
Weighing modes — what it means Extra modes beyond normal weighing: for example, a baby or pet held in your arms (the adult's weight is subtracted from the total), a guest mode that does not store data, a balance test.	Baby or pet in arms, guest mode, small object weighing, balance testModes can be switched only while connected to the Mi Home / Xiaomi Home app. Small objects: 0.1–10 kg, their weight is not saved; guest mode does not store data [1]
Age range for body composition — what it means The age range for which the manufacturer calculates body composition. For people outside this range the manufacturer does not claim body composition results.	6–80 yearsHeight 90–220 cm as well. Children under 6 and people over 80 get weight only; data for adolescents is for reference [1]
Display on the scale — what it means What kind of display the scale has. Hidden LED digits usually show through the glass only during a measurement; a colour screen can show several metrics and charts; without a display the result is visible only in the app.	LED digitsLED display under the glass [3]
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.	Weight, body fat percentage, heart rateAlso a low-battery warning, Bluetooth status and a '√' when weight, body fat and heart rate are within the standard range. The displayed unit is set in the app [1]
Measurement units	kg, lb [2]
Minimum measurable weight	0.1 kg [2]
Weight range for body composition	20–150 kg [1]
Height range for body composition	90–220 cm [1]
BIA frequencies	50 kHz and 250 kHz [1]
Electrode pad diameter	58 mm [1]

Measurement and detection6

Number of metrics — what it means How many metrics the manufacturer reports after one weighing: weight, BMI, body fat percentage, muscle mass, water, visceral fat and so on. Brands count metrics differently, so the full list is given in the note.	25Weight, heart rate, BMI, body score, body water mass and percentage, body fat percentage and fat mass, protein mass and rate, muscle mass and rate, bone mineral mass and rate, visceral fat, basal metabolic rate, lean body mass, body type, estimated waist-hip ratio, body age, skeletal muscle mass, weight/muscle/fat control, standard weight. The full report is in the Mi Home / Xiaomi Home app [1]
Electrodes — what it means Which points of the body the resistance is measured through. With 4 electrodes under the feet the current flows mainly through the legs and the upper body is estimated by calculation. Scales with 8 electrodes and a handle also measure through the hands, so they can estimate arms, legs and trunk separately.	4 electrodes under the feetMeasured through the feet only: both feet on 58 mm electrode pads; four pads are visible in the official images, the count is not stated in text [1]
Body composition frequencies — what it means How many current frequencies the scale uses to measure body resistance. A single frequency (usually 50 kHz) gives an overall estimate; two or more frequencies allow water inside and outside the cells to be estimated separately. The exact frequencies are given in the note.	Dual frequency50 kHz and 250 kHz [1]
Heart rate measurement — what it means Whether the scale can measure resting heart rate while the person stands barefoot on the platform. It is an indicative value, not a medical measurement.	YesResting heart rate is measured after the body composition measurement; on by default, can be turned off in the app [1]
Maximum capacity — what it means The highest weight the scale can measure. The minimum measurable weight, if the manufacturer states it, is in the note.	150 kgMeasurement range 0.1–150 kg; body composition is calculated for a weight of 20–150 kg [2]
Weight resolution — what it means The step in which the scale shows weight (minimum division): with a 100 g step readings go 72.3 → 72.4 kg, with 50 g — 72.35 → 72.40 kg. Resolution is not accuracy: the manufacturer states the error separately, if at all.	100 g [2]

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.	Bluetooth LEBluetooth Low Energy 5.0 [2]
How data reaches the app — what it means Whether a phone has to be nearby when you weigh yourself. If data goes only to the phone over Bluetooth, without it measurements may be kept in the scale's memory until the next sync — the memory size, if stated, is in the note.	Directly to the phone over Bluetooth, via a Bluetooth gateway (hub, smart speaker)Through a Xiaomi Bluetooth gateway (sold separately) measurements upload to the cloud automatically without a phone nearby [1]
App — what it means The maker’s app used to set up and control the device.	Mi Home / Xiaomi HomeAndroid 8.0 or iOS 12.0 and later; app version 8.7.703 (Android) / 8.7.204 (iOS) or later. Not compatible with Mi Fitness [1]
Health app sync — what it means Which third-party apps can receive weight and other metrics, so you can see them next to your watch or fitness band data. Only what the manufacturer states is shown.	Not stated by the manufacturer
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 the brand's integrationModel MJTZC01YM is in the device list of the xiaomi-ble library behind Home Assistant's built-in Xiaomi BLE integration (weight, heart rate, profile ID). A Bluetooth adapter or proxy and an encryption key (bindkey) from the Xiaomi cloud are needed. The integration page does not name the model; the 25 body composition metrics are not passed [4]
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.	BLE 5.0 [2]
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.	No hub neededWorks directly with a phone over Bluetooth; a Bluetooth gateway is optional, for automatic sync [1]

Power4

Power source — what it means Where the device gets its power: 230 V mains, an adapter, USB, batteries or a built-in battery.	Replaceable batteries [2]
Batteries or battery — what it means Which cells it takes and how many. A built-in rechargeable battery is stated in the value.	3 × AAA (alkaline, 4.5 V) [2]
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.	6 monthsUp to 180 days with 3 weighings a day of about 45 s each at 25 °C (Yunmai laboratory data) [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.	4.5 V ⎓ (3 × AAA) [2]

Housing and installation3

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.	300 × 300 × 24.55 mm [2]
Weight — what it means The device’s weight without packaging, per the maker.	1450 g [2]
Housing material	Reinforced glass + engineering plastic [2]

Model and version1

Manufacturer variant	MJTZC01YM [2]

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.	0–40 °C [2]

Package contents1

Package contents — what it means What comes in the box, per the maker.	Xiaomi Body Composition Scale S400 × 1, user manual × 1The maker does not state whether batteries are included [2]

Manufacturer documents

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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.

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Power — Replaceable batteries: plan it for the mounting spot.

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