Garmin Index Sleep Monitor

Quick details

Released

June 2025

Dimensions

Module: 41.7 x 37.6 x 7.8 mm; S-M band: 326 x 63.5 x 0.55 mm; L-XL band: 452 x 63.5 x 0.55 mm

Operating system

Proprietary embedded firmware

Display Screenless

Battery life Up to 7 nights with SpO2

Water resistance 5 ATM

GPS No

Sensors Accelerometer, optical heart rate, Pulse Ox, skin temperature

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Technical specifications

General

Release date 2025-06-18

Product type Screenless sleep tracker

Physical size Module: 41.7 x 37.6 x 7.8 mm; S-M band: 326 x 63.5 x 0.55 mm; L-XL band: 452 x 63.5 x 0.55 mm

Weight Module: 14.5 g; S-M band: 15.8 g; L-XL band: 20.0 g

Material Plastic module; band is 70% nylon and 30% spandex

Water resistance 5 ATM

Display type None (screenless)

Display size None

Display resolution None

Display brightness None

Display protection None

Battery Rechargeable built-in lithium-ion battery

Battery life Up to 7 nights with SpO2 during typical use

Charging Garmin charging/data cable

Sensors

GNSS type None

GPS No

GALILEO No

GLONASS No

QZSS No

Beidou No

Accelerometer Yes (for sleep)

Gyroscope No

Barometric altimeter No

Compass No

Geomagnetic No

Ambient light sensor No

Optical heart rate Yes

Electrical heart rate No

SpO2 Yes

Temperature Yes

Galvanic skin response No

Microphone No

Speakers No

Vibration motor Yes (smart wake alarm)

Health & activity tracking

Steps No

Distance No

Calories burned No

Floors No

Sports tracking No

Sleep Yes

Heart rate Yes

HRV Yes (HRV status)

Stress Yes (overnight)

Blood oxygen Yes (during sleep)

Respiration rate Yes

Skin temperature Yes

ECG No

Blood pressure No

Body composition No

Glucose No

Hydration level No

UV exposure No

Calorie intake No

Hyperglycemia risk assessment No

Arterial stiffness detection No

Pulse wave arrhythmia analysis No

Daily smart features

Smartphone compatibility iPhone and Android

Operating system at launch Proprietary embedded firmware

Bluetooth Yes (Bluetooth Low Energy 5.0)

Wi-Fi No

NFC / connected pay No

UWB No

Cellular No

Smartphone notifications No

Bluetooth calling No

Smartphone music control No

On-board music storage No

Voice assistant No

Garmin performance & training

Body Battery Yes

Training Readiness No

Training Status No

Training Load Focus No

Endurance Score No

Hill Score No

Real-Time Stamina No

Running Tolerance No

Running Economy No

Step Speed Loss No

Performance Condition No

PacePro No

ClimbPro No

Jet Lag Adviser No

Daily Suggested Workouts No

Race Widget No

Morning Report No

Garmin Coach No

Garmin golf

Golf course maps No

Green View No

Hazard View No

Garmin AutoShot No

PlaysLike Distance No

PinPointer No

Touch Targeting No

Virtual Caddie No

Green Contours No

Club tracking compatibility No

Swing Tempo No

Tempo Training No

Garmin tactical

Stealth Mode No

Kill Switch No

Jumpmaster No

Night Vision compatibility No

Applied Ballistics No

Garmin aviation

Direct-to/Nearest airport navigation No

Aviation maps No

METAR/TAF weather No

NEXRAD radar No

Automatic flight logging No

Garmin Pilot flight-plan transfer No

Garmin diving

Dive modes No

Air integration No

SubWave networking No

Dive Readiness No

DiveView maps No

Diver-to-diver messaging No

Garmin marine

Chartplotter connectivity No

Autopilot control No

Fusion-Link No

Boat data streaming No

Tide data No

Garmin ecosystem

Connect IQ No

Built-in inReach No

Links

Affiliate link Amazon, Garmin

These technical specs are correct to the best of our knowledge at the time of publishing.