Which Withings Do You Have? Identifying Your Hardware Generation

Over the lifetime of its sleep tracking line, Withings has released multiple hardware revisions, including the original Nokia Sleep, the Withings Sleep, and the medical-grade Withings Sleep Analyzer. Because firmware capabilities, apnea detection algorithms, and cable configurations vary significantly across these generations, identifying your exact model ensures you follow the correct troubleshooting path.

Quick Answer

Identify your Withings sleep mat by checking the printed label on the internal plastic module inside the fabric cover. The original Nokia/Withings Sleep carries model number WSM02, while the newer Withings Sleep Analyzer is designated WSM03. The WSM03 features an upgraded sound sensor for sleep apnea detection and uses a captive power cord.

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The Evolution of the Withings Sleep Hardware

Withings has produced three primary versions of its under-mattress sleep tracking hardware:

[ Nokia Sleep (2018) ] ──> [ Withings Sleep (2019) ] ──> [ Withings Sleep Analyzer (Current) ]
   Model: WSM02                Model: WSM02 (Rebranded)     Model: WSM03
   Modular Micro-USB           Modular USB Cable             Captive Reinforced USB
   Basic Snoring               Sound Sensor Added            Medical-Grade Sleep Apnea (EU/FDA)

1. Nokia Sleep (WSM02, 2018): Released during Nokia’s brief acquisition of Withings. Features Nokia branding on the cover and uses a modular, detachable Micro-USB cable.
2. Withings Sleep (WSM02, 2019): Released after Withings became independent again. Carries the Withings logo, retains the WSM02 model number, and relies primarily on ballistocardiography with basic snore tracking.
3. Withings Sleep Analyzer (WSM03, Current Generation): Features upgraded sensor hardware, including an internal acoustic sensor specifically calibrated to track medical-grade sleep apnea and breathing disturbances.

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Physical and Technical Comparison Matrix

Use this comparison table to identify your hardware:

Feature / Specification	Original Nokia Sleep	Withings Sleep	Withings Sleep Analyzer
Model Number on Label	WSM02	WSM02	WSM03
Exterior Branding	“Nokia” stitched on tab	“Withings” stitched on tab	“Withings” stitched on tab
USB Cable Type	Detachable Micro-USB	Detachable USB-A to Micro-B	Captive / Hardwired USB-A
Cover Textile Color	Light Gray Melange	Slate Gray	Dark Charcoal / Heather Gray
Acoustic Sensor	Basic Snore Audio	Basic Snore Audio	Medical-Grade Sound Sensor
Sleep Apnea Classification	No (Disturbances only)	Breathing Disturbances only	Clinical Apnea Detection
Reset Switch Type	Recessed Pinhole	Recessed Pinhole	Recessed Pinhole with LED Ring

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How to Find the Model Number and Serial Information

The definitive way to confirm your hardware version is by reading the regulatory label on the plastic electronics module:

┌──────────────────────────────────────────────┐
│ Model: WSM03            [ Regulatory Marks ] │
│ S/N: 00:24:e4:xx:xx:xx  FCC ID: XXXXX        │
│ Input: 5V === 1A                             │
│ Made in China           Withings             │
└──────────────────────────────────────────────┘

Step 1: Open the Fabric Encasement

1. Unplug the mat from wall power.
2. Locate the zipper on the outer textile sleeve and unzip it 6 to 8 inches.
3. Locate the black or dark gray plastic module attached to the internal air bladder.

Step 2: Read the Regulatory Print

1. Look at the flat side or back of the plastic module.
2. Find the line marked Model:
   • If it reads WSM02, you have an original Nokia Sleep or early-generation Withings Sleep.
   • If it reads WSM03, you have the current Withings Sleep Analyzer.
3. Note your 12-character MAC address (format 00:24:e4:xx:xx:xx), which serves as the unique hardware identifier for your home network router.

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Finding the Model in the Withings Mobile App

If your mat is already installed under a heavy mattress and currently connected to your network, you can identify the hardware without unzipping the cover:

1. Open the Withings app on your phone.
2. Tap the Devices tab at the bottom right.
3. Select your sleep tracking mat.
4. Scroll down and tap Technical Information:
   • Model: Displays either Sleep (WSM02) or Sleep Analyzer (WSM03).
   • Firmware Version: Displays your current operating build (e.g., 2001 or higher).
   • Serial Number: Matches the physical MAC address on the internal module.

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Why the Generation Difference Matters for Troubleshooting

Knowing your specific model prevents misdiagnosis and helps resolve issues faster:

• Power Supply Replacement: If you damage the cord on a WSM02, you can replace it with any standard off-the-shelf USB cable. If you damage the cord on a WSM03, the cable is hardwired into the enclosure and must be spliced using the steps in Frayed USB Cable? How to Replace Your Withings Power Cord.
• Feature Availability: If your app does not show clinical Sleep Apnea severity metrics, verify whether you have a WSM02. The older WSM02 model lacks the dedicated acoustic hardware required for clinical apnea tracking and only records general breathing disturbances.
• Pump and Bladder Parts: Replacement air bladders, pump valves, and internal line barbs differ between the WSM02 and WSM03 revisions. Knowing your model ensures you use the correct parts when completing pneumatic repairs like Withings Leak? How to Repair a Punctured Sleep Air Bag.