AURA Strap
boosts your
Apple Watch
AURA Strap is the only way to measure your hydration levels and body composition right on your Apple Watch. We put an ultimate technology into a tiny strap for the Watch for just $119.
US delivery takes 6-8 days.
Check delivery times for other countries here.



Body composition

Bioimpedance analysis allows AURA Strap to measure fat and muscle mass in your body



It is important to stay hydrated. AURA Strap allows you to track your hydration levels anytime


App for Apple Watch and iPhone

Companion app will help you to understand measured data and set new goals


Long life on single charge

AURA Strap run up to 6 months on a replaceable coin battery if you're doing measurement every day

How it works


Open the AURA App on your Apple Watch

Supports any Apple Watch from Series 1 or later.


Push-button on the Strap

Works for up to 6 months on a single replacement battery.


Touch electrodes

This creates a circuit allowing measurement to begin.


Wait for 30 seconds

AURA Strap needs stable data about your body’s active and reactive resistance.


See the result

You can now view all your data from the companion app on your Watch and iPhone.



AURA Strap keeps track of your fat, muscle and bone volume as well as your hydration levels

Bioimpedance is the core technology enlarging Apple Watch's health monitoring abilities. It breaks down your body into four components: fat, muscle mass, minerals, and body water, and gives personalized insights to improve your workouts results and lifestyle.


Your goals

With AURA Strap you can precisely track your body changes and achieve fitness goals. For example, if you want to become stronger, you can just set a target numerical goal in AURA App, like to gain 7 pounds of muscles during a month and lose 4 pounds of fat, monitor your body composition every day and track your progress.

This way you will know which workouts or activities fit your body better. It will help you achieve your goal faster.


Bioelectrical impedance vector analysis

Bioelectric Impedance Vector Analysis (BIVA) is a graphic display that was developed for a better body impedance interpretation. It presents coordinate systems with tolerance zones for the graphic display of body impedance with hydration, fat, and muscle mass indices.

AURA Devices conducts this analysis and presents its results on display in addition to the traditional display of BIA numerical values, percentile curves, and bar graphs. Our system will help you to understand how your body changes after every single measurement.



Our bodies are about 70% water. So it makes sense that one of the most important things related to your health is hydration. Water gives us mineral elements and even more critical, electrolytes. With AURA Strap, you can monitor hydration levels every day or every hour (or even more frequently if you want).

You can get dehydrated and not even know, as our body does not necessarily signal us about it. AURA Strap tells you when to drink a glass of water based on your activity data and your body hydration levels.


Your data in one app

AURA App safely & securely keeps all fitness data with easy access for the user.

Your goals
Bioelectrical analysis
Your data in one app

Track hydration
with AURA Strap

Monitor your hydration to know when you should drink a glass of water.

Monitor your hydration to know when you should drink a glass of water. Our bodies are about 70% water that is why it's so essential to stay hydrated. Water gives us mineral elements and electrolytes, improves our immune system, as many metabolic functions rely on it. AURA Strap is your unique opportunity to check hydration anytime and anywhere on your Apple Watch.


As seen on

"Aura squeezes its fitness band into an Apple Watch 'Smart Strap'. It uses bioimpedance to give a body composition and hydration level reading."


"AURA Strap replaces your boring Apple Watch band with more health sensors..."


"It's not a smartwatch, but this add-on band for Apple Watch could bring some seriously impressive skills to your wristy companion..."


"AURA Devices go beyond counting calories and steps to help you get healthy. The AURA Strap is an add-on to your Apple Watch to make it the ultimate fitness tool."



  • Features

    Fat / Muscle measurement
    Hydration level tracking

  • In/Out

    Ultrasound interface for connection to Apple Watch

  • For everyone

    Stainless steel contacts of unique form for hairy and dry hands
    Adjustable nylon straps for any wrist

  • Up to 6 months of hard work

    Single standard, replaceable watch battery (CR2025) included
    High water resistance

  • Syncs with your favorite Watches

    Supports Apple Watch Series 1 or newer and HealthKit
    Companion app for Apple Watch and iPhone



  • Package


    Neylon AURA Strap
    Coin battery (CR2025)
    Screwdriver for battery replacement
    Quickstart Guide


Easy to buy


Choose AURA
Strap size


Add to your cart
& provide payment


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the product

*Free shipping available for the US


your Strap

Boost your Apple Watch

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What does it do?
AURA Strap measures your body composition and hydration levels on your Apple Watch.
Does it work with my Apple Watch?
AURA Strap supports Apple Watches Series 1 or newer, and it connects with 38/40 and 42/44 mm Watches.
How could body composition tracking help me
A series of day-by-day measurements provides a trend of your body composition changes. It makes your workouts more efficient because you can understand (by numbers) what exercise is definitely good or bad for you.
Does it measure hydration?
Yes, AURA Strap measures how much water you have in your body with the help of bioimpedance analysis.
Does AURA Strap fit my wrist?
AURA Strap comes in two sizes for 38/40 mm and 42/44 mm Apple Watches. Small AURA Strap fits 144 - 200 mm wrists in circumference and bigger one fits 150 - 225 mm wrists.
Is it waterproof?
Yes, AURA Strap is water resistant. You can wash your hands, go to shower and even swim with your device.
What are the material electrodes made?
Electrodes on each side of the device are made of medical stainless steel (contains nickel).
How long does it work on a single charge?
AURA Strap works up to 6 months on a standard, replaceable wristwatch battery (CR2025). Then you change it with the included screwdriver, and it's ready to use.
Is it safe to use AURA Strap with a pacemaker?
No, we don't recommend using the device with a pacemaker.
How does Strap connect with Apple Watch? Is it secure?
AURA Strap uses high-frequency sound to transfer measured data. We use a microphone on Apple Watch to receive all the parameters. AURA app only uses it during the measurement and doesn't store or process the sound data for other needs.
The estimated delivery date for each shipment is based on your location. The average delivery takes from 7 to 20 days.