PROTECT THE SIGNAL
Sensor Bio V2
A screenless general wellness wearable that streams raw PPG (green, red, infrared), motion and skin temperature at up to 100 Hz.
5-7 days
Continuous 24/7 wear
100 Hz
SDK stream and web download
3 wavelengths
Green, red, infrared PPG
IP68
1.5 m for 30 minutes
1 oz
Sealed one-size band
BLE 5.0
Bluetooth 4.0 minimum
±0.1°C
Skin temperature accuracy
~14 days
On-device buffer
15 min
Emergency charge to 20%
2 GB
Per export file
8 SDK surfaces
From vitals to live stream
5-7 days
Continuous 24/7 wear
100 Hz
SDK stream and web download
3 wavelengths
Green, red, infrared PPG
IP68
1.5 m for 30 minutes
1 oz
Sealed one-size band
BLE 5.0
Bluetooth 4.0 minimum
±0.1°C
Skin temperature accuracy
~14 days
On-device buffer
15 min
Emergency charge to 20%
2 GB
Per export file
8 SDK surfaces
From vitals to live stream
Key facts
- Model
- Sensor Bio V2, model #S2001
- Form factor
- Screenless wrist band, low-profile curved sensor module
- Sensors
- Optical emitter: One multi-LED package with infrared, red, and green. Photodiodes: Two. Motion sensor: 3-axis accelerometer. Temperature sensor: Skin temperature sensor on the underside
- Sampling
- 50 Hz by default, configurable to 25 or 100 Hz per organization
- Raw data
- Raw multi-wavelength PPG is available today through the Mobile SDK raw stream and a per-organization web platform download.
- Continuous wear and battery
- 5 to 7 days at default duty-cycled 24/7 wear
- Water and dust resistance
- IP68. Safe for rain, sweat, and hand-washing.
- Regulatory
- General wellness device. Not FDA cleared or approved. Not for diagnostic use.
Overview
Design principles
Four properties decide whether a wearable can carry institutional work. V2 was built around all four.
01 / Raw data
The full waveform, not the summary
Raw multi-wavelength PPG, inter-beat intervals and 3-axis accelerometer data at up to 100 Hz, via the Mobile SDK raw stream or a per-organization download. Every score shows the signal that drove it.
02 / Platform
One system, every use case
The band, cloud and SDK are one product that enterprise, defense and research teams build on directly.
03 / White label
Your brand on the signal
Native white label from the first deployment: your brand on the hardware, app and reporting.
04 / Configurable
Shaped to the deployment
Capture cadence, data model, retention, alerting and reporting are set per environment: a workplace, a base or a research protocol.
Features
Features
What V2 measures, how long it runs, and how the data reaches your team.
Sensor Bio V2Screenless wellness band
One multi-LED package, two photodiodes, a 3-axis accelerometer and a skin temperature sensor.
Raw PPGGreen, red and infrared
Sampled at 25, 50 or 100 Hz.
HRV and resting heart rate
From beat-to-beat intervals.
SpO₂Blood oxygen
Wellness-level SpO₂ from the red and infrared channels.
Skin temperature
Sensor on the underside, accurate to ±0.1°C.
SleepDetected automatically
Stages, overnight heart rate and HRV, with no manual logging.
Raw data in your code
Stream raw PPG with the Mobile SDK, or download it per organization.
Made for 24/7 wear
IP68. Safe for rain, sweat and hand-washing.
5 to 7 daysBattery
At default 24/7 wear. About 15 minutes of charging reaches 20%.
Private label ready
Your brand, your packaging, your strap colors.
Fleet deploymentFor research teams
Configure and manage bands across a study or an organization.
Private label
Private label
Ship V2 under your brand. Your packaging, your strap colors, your app built on the Sensor Bio SDK.
Branded packaging
Your name, colors and artwork on the box.
Strap colors and materials
A strap that looks like your brand, not ours.
Your app on the SDK
Your own app experience, built on the Sensor Bio SDK.
Six concept designs, from endurance to recovery. These are examples, not customer brands.
Concept design
A wellness tracker stops at the score.
V2 shows the score, the raw signal behind it, and the data to prove it.
truth over interpretation
3D deep dive
Inside Sensor Bio V2
Scroll to open Sensor Bio V2 from the closed module to an exploded view, rendered from the Sensor Bio V2 rev 9 CAD with the vibration motor added as a reference model.
Top shell
The outer housing of the module.
Main board (processor, radio, power)
The board that runs the sensor and the radio.
Vibration motor
On the main board. Haptic alerts you feel on the wrist.
LED and status board
Status light and the LED driver board.
Battery
The cell inside the housing.
Button
The control on the side of the shell.
Optical window with two photodiodes and multi-wavelength LED (green, red, IR)
The skin-facing light path.
Skin temperature contact
On the underside, against the skin.
Charging contacts
The contacts used to charge the module.
Multi-wavelength optics
Infrared, red and green light leave one package, cross a clear optical window into the skin, and return to two photodiodes. Depth differences come from the wavelengths, not measured thickness.
Multi-LED package and two photodiodes
One multi-LED package holds all three wavelengths, and two photodiodes give two detection paths for cross-checks. Placement and spacing are not shown because CAD has not confirmed them.
Motion and skin temperature
The 3-axis accelerometer is the motion reference for artifact handling and the source of activity and sleep context. The underside skin temperature sensor (±0.1°C) tracks skin temperature against the wearer's baseline, not core temperature.
Built for continuous wear
A sealed sensor and strap: 5 to 7 days of wear at the default duty cycle, IP68 for rain, sweat and hand washing, BLE 5.0, and optical sampling up to 100 Hz. These are engineering limits, not health claims; see the hardware specification.
Hardware specification
Specifications
| Model | Sensor Bio V2, model #S2001 |
|---|---|
| Form factor | Screenless wrist band, low-profile curved sensor module Sensor and strap ship as a sealed, non-separable unit. One size, no S/M/L. No display, by design. |
| Case and housing material | Plastic wristband form factor Clear optical window covering the optical sensors against the skin |
| Sensor hardware | One multi-LED package with infrared, red, and green (~940 nm, ~655 nm, and ~530 nm) Two photodiodes 3-axis accelerometer, ±8G default range, ±16G maximum. No GPS. Skin temperature sensor on the underside, accurate to ±0.1°C |
| Sampling | 50 Hz by default, configurable to 25 or 100 Hz per organization Configurable duty cycle. Up to 100 Hz via the Mobile SDK raw stream and per-organization download. |
| Continuous wear and battery | 5 to 7 days at default duty-cycled 24/7 wear From empty: 20% in about 15 minutes, full in 120 to 240 minutes. High-frequency research sampling or frequent active syncing drains it faster |
| Water and dust resistance | IP68. Safe for rain, sweat, and hand-washing. Submersion up to 1.5 m for up to 30 minutes. |
| Weight | Device, sensor and strap together: approximately 1 oz Package weight: 4 oz |
| Operating temperature | −40°C to +85°C |
| Connectivity | Bluetooth Low Energy 5.0. Minimum phone requirement Bluetooth 4.0. No pairing, PIN or bonding. Connect by double-clicking the device button in the app. |
| On-device storage | About 14 days at default sampling; oldest data is overwritten when full Continuous high-frequency recording cuts this to as little as 30 minutes |
| On-wrist detection | Yes. Shuts down about 0.5 seconds after removal. |
| Real-time clock | Yes. The mobile app writes UTC time to the device. |
| Charging and identification | Proprietary USB-C cable for any standard USB power source; no wall adapter included No printed serial number; the device is identified electronically after it syncs to the app |
Signals captured
Measurements
Every derived metric ships next to the raw series it came from. Capture cadence is a configuration, not a fixed behavior. Each metric links to its unit, derivation and capture detail on the Biometrics page.
| Metric | Needs from the hardware | Detail |
|---|---|---|
| Heart rate | Green PPG at any sampling rate. 25 Hz gives heart rate only. | How it is measured: Heart rate |
| Heart rate variability | PPG at 50 Hz or higher (the V2 default), still wearer | How it is measured: Heart rate variability |
| SpO₂ | Red and infrared PPG channels both enabled | How it is measured: SpO₂ |
| Respiratory rate | PPG at 50 Hz or higher | How it is measured: Respiratory rate |
| Skin temperature | Skin temperature sensor on the underside | How it is measured: Skin temperature |
| Sleep | PPG and accelerometer. Full REM staging needs enough PPG sampling. | How it is measured: Sleep |
| Activity and scores | 3-axis accelerometer and PPG | How it is measured: Activity and scores |
| Spot checks | A still wearer for at least 3 minutes | How it is measured: Spot checks |
Raw outputs: green, red and infrared PPG, beat-to-beat intervals and the 3-axis accelerometer, through the Mobile SDK raw stream and a per-organization download. Raw data
Battery and PPG
Battery, sampling and optical signal
Sensor Bio V2 is a general wellness device. It is not FDA cleared and is not intended to diagnose, treat, cure, or prevent any disease.
Battery life and sampling configuration
At the default duty cycle (50 Hz sampling for 45 seconds every 5 minutes), Sensor Bio V2 lasts about 5 to 7 days per charge. Higher sample rates, longer active windows, or more continuous PPG shorten battery life. Sensor Bio provides white-glove configuration per customer so sample rate, wavelengths, and which sensors run match the protocol. The accelerometer can log with or without PPG. Battery life for non-default configurations is set during that configuration process with your team.
Multi-wavelength PPG, skin tone, and motion
Sensor Bio V2 uses green, red, and infrared LEDs with two photodiodes behind a clear optical window, plus a 3-axis accelerometer. Multi-wavelength PPG is used in research and product design because different wavelengths interact differently with melanin and tissue, and because red/infrared channels support SpO2-style estimates alongside green-based heart rate pipelines. Motion still distorts optical signals; the accelerometer is there so pipelines can detect and handle motion artifacts. Fair accuracy across skin tones requires diverse validation cohorts and quality gating, not marketing claims. Sensor Bio publishes raw waveforms so partners can apply their own quality checks. See our Signal reviews on PPG signal quality and skin tone validation for the literature framing.
PPG signal quality reviewPPG skin tone validation review
- Allen J. Photoplethysmography and its application in clinical physiological measurement. Physiol Meas. 2007.
- Han S, Roh D, Park J, Shin H. Design of multi-wavelength optical sensor module for depth-dependent photoplethysmography. Sensors. 2019.
- Cabanas AM, Fuentes-Guajardo M, Latorre K, Leon D, Martin-Escudero P. Skin pigmentation influence on pulse oximetry accuracy: a systematic review and bibliometric analysis. Sensors. 2022.
- Zhang Z. Photoplethysmography-based heart rate monitoring in physical activities via joint sparse spectrum reconstruction. IEEE Trans Biomed Eng. 2015.
Software-derived scores
Cloud-computed scores
Every score comes from the exported signal, so partners can rebuild any number from the data.
Activity score
0 to 100
A logarithmic combination of heart rate reserve, the cardiovascular effort, and musculoskeletal movement across the day.
Sleep score
0 to 100
Sleep quality and duration from all overnight biometrics, auto-detected.
Recovery score
0 to 100
Overnight readiness composite. Appears after a 5-night baseline; naps do not count yet.
Resting heart rate
Lowest sustained HR
Lowest sustained heart rate during sleep, computed in the cloud.
Resting HRV
rMSSD
The primary overnight HRV, from the lowest-activity period of sleep.
Spot check panel
On-demand scan
Manual scan: HR, HRV (rMSSD, SDNN), mean RR, stress index, respiratory rate, LF, HF and LF/HF, Poincaré SD1, SD2 and SD1/SD2, ANS balance, and SNR in dB.
SDK and platform
SDK and platform features
Eight categories of physiological data, per day or date range, with the datapoints under every summary. Raw multi-wavelength PPG comes through the Mobile SDK raw stream or a per-organization download.
01 / Vitals
Continuous core signals
- Cardiac
- Daily and trending heart rate with a Poincaré plot, plus HRV in the same views.
- Respiratory
- Respiratory rate, daily and trending.
- Thermal
- Skin temperature: min, max, average, and the full point series.
02 / Activity
Movement and energy
- Counts
- Steps graphed over time, and calories.
- Scoring
- Daily activity score with baseline difference and progress percentage.
- Duration
- A daily running total of movement duration.
03 / Recovery
Readiness, daily and ranged
- Score
- Daily recovery score compared across weeks, months, and years.
- Calibration
- After calibration, scores reflect the wearer's own physiological changes.
- Aggregate
- Use the underlying biometrics or one aggregate score.
04 / Sleep
The deepest surface in the SDK
- Score and stages
- Sleep score with running average, contributing factors and penalties, plus awake, REM, light and deep percentages and minute-by-minute stages.
- Overnight vitals
- Resting HR and HRV, full HR, HRV and respiratory-rate graphs, and skin temperature min, max, average, uncertainty and baseline.
- Timing
- Total sleep time, onset and wake times, and per-session timing, naps included.
- Guidance and debt
- Recommended bedtime, wake time and duration, plus circadian score and three-night sleep debt.
05 / Spot check
On-demand snapshot
- Autonomic
- HRV against baseline, and parasympathetic to sympathetic balance.
- Cardiorespiratory
- Min, max, and average HR with a graph, plus respiratory rate and stress index.
- Confidence
- Signal-to-noise ratio on the reading, and a PDF report link.
06 / Workouts
Session-level biometrics
- Heart rate
- Per-workout average, min, and max heart rate.
- Zones
- Time-in-zone breakdown for the session.
- Views
- Summary, detail, and timeline endpoints per workout.
07 / Profile
Cloud-synced attributes
- Performance
- VO₂ max, max HR, and computed max HR.
- Anthropometrics
- Height, weight, and walk / run stride.
- Bulk pull
- Biometrics, sleep, and steps across a date range in one call.
08 / Live stream
Raw signal, in real time
- Channels
- In an active session, the Mobile SDK raw stream carries HR, HRV, respiratory rate, beat-to-beat intervals, raw multi-wavelength PPG, signal-to-noise ratio and motion. Per-organization download works today.
- Why it matters
- The ground-truth channel wellness trackers never expose, and the source of everything above.
From the Sensor Bio SDK interface, v0.17.0. Categories 1 to 7 load from the cloud after sync, per day or date range, cached or force-remote.
Deployment model
Deployment options
| Raw signal access | Raw multi-wavelength PPG, IBI, and 3-axis accelerometer, up to 100 Hz Available today through the Mobile SDK raw stream and a per-organization web platform download |
|---|---|
| Backend model | Sensor Bio cloud platform, hosted on AWS Every partner builds directly on the same infrastructure |
| Export windows and formats | Per-organization raw sensor download, 1 to 7 day window Computed metrics export, 1 to 30 day window CSV or JSON, up to 2 GB per file |
| History and retention | Retention set per deployment |
| White label and OEM | Native white-label, partner brand from the first deployment |
| Customization | Configured per deployment: enterprise, defense, or research Data model, retention, and reporting shaped to the environment |
| REPORTING | Custom web dashboard with derived metrics and per-organization raw multi-wavelength PPG download Trending window set by the partner, not by us Signal Studio on the web platform for organization-level alerting rules |
Regulatory and compliance
Certifications and regulatory status
Sensor Bio V2 is a general wellness device. It is not FDA cleared and is not intended to diagnose, treat, cure, or prevent any disease.
| Classification | General wellness device. Not FDA cleared or approved, and not for diagnostic use. No prescription required. Sensor Bio V2 is a B2B platform product. |
|---|---|
| FCC ID | 2BTF2-S2001 |
| IC | 34896-S2001 |
| Certifications | CE and UKCA certified RoHS and WEEE compliant |
| Origin | Designed in the USA, made in China |
Protect the Signal.
Bring us the deployment.
We will tell you what the signal can carry.
Better signal → better insights → better health.