AURA Strap 2

AURA Strap 2

Easily build the body of your dream

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iPhone with AURA App and Crimson Red Strap 2

AURA Strap 2 for Apple Watch transforms your favorite watch into the ultimate goal-getter!

Lose weight mindfully using science and personalized data, and keep long-lasting results.

We’ll help you set your goal, better understand your actual body changes, be more attentive to your habits, and achieve your diet and fitness goals more quickly while respecting your body’s limits.

The route to your dream body can be challenging, but we know how to make it easier

Man and Woman excercise in the gym

Body fat & muscle monitoring

AURA Strap 2 brings body composition and water level tracking right to your Apple Watch. Monitor how your body parameters change during your diet and workouts to ensure you're on the right track and hit your goals properly.

Man taking measurement and AURA App screen with Fat chart

Advanced analytics & reports on your progress

Use our detailed reports to check your body's actual dynamics and see your changes, so you can better understand your performance and improve results. We'll show you the smoothest and fastest possible way to build the body of your dreams.

Woman with Strap 2 drinking water and AURA App screen with Personalized advices

Personal recommendations based on your data

Get personalized recommendations in the AURA App based on your body composition data. Follow our complete guidance on your health and fitness journey, including calorie intake, meal preferences, and workout frequency.

Woman's hand with Strap 2 and AURA App screen with Goal settings menu

Goal setting and tracking

Set your goal, track your progress with our advanced analytics & reports, and follow personalized recommendations to reach your destination with the right level of effort, without overtraining.

  • Male is taking measurement with Strap 2

    One-touch measurement

    The measurement is easy. Just touch the electrodes, wait for 30 sec, and get the results.

  • AURA App. Dashboard

    Easy-to-read measurement results

    Use our dashboards to check your measurements and see trends in your body changes.

  • AURA App Biogram

    See your weight loss progress

    Use Biogram, our exclusive in-app tool, to see your current position and progress toward your fitness goal.

  • Two AURA App Watch faces

    Set data on Watch faces

    Use our Watch faces to see your body composition data right on your Apple Watch.


"If you do have a specific body goal — whether it’s to lose weight or get jacked — the Aura app will also contextualize where you’re at and how to get there. I set my goal as an “athletic” body with muscle gain. The app, in turn, told me I’m about 80 percent of the way there already and recommended I increase my caloric intake by 10–15 percent, add more protein to my diet, and do no more than three workouts per week."

Victoria Song, The Verge

Explosion diagram of AURA Strap 2

What’s included

• AURA Strap 2
• Infinite Loops
• Coin Battery (CR1632)
• Pick for Battery and Loop replacement
• Quickstart Guide

Woman takes measurement on AURA Strap 2
Black AURA Strap 2 on the Woman's hand in motion
Black AURA Strap 2 on the Woman's hand

  • 95% measurement accuracy

    Read more 
  • Sync with Apple HealthKit

  • Lots of body composition parameters

  • Battery life up to 6 months

  • Stretchable Infinite Loop fits any wrist

  • 4 Loop sizes in the box

  • Reliable BLE connection

  • Waterproof enclosure

  • Free shipping

    All orders containing a device include free shipping in the US

    See the conditions 
  • 15-day returns

    We accept all returns within 15 days. No questions asked.

  • Secured payments

    Shop with confidence: all payment details are protected via SSL encryption.

  • 1-year warranty

    We'll repair or replace your device for any covered issue for 1 year after you receive your product.


What does it do?

AURA Strap 2 measures your body composition and hydration level on your Apple Watch.

Does it work with my Apple Watch?

Supports Apple Watch Series 3 to Series 9, including Ultra 2 and SE. It connects with 38/40/41 and 42/44/45/49 mm Watches. Choose the size to fit your Watch.

How can body composition tracking help me?

A series of day-by-day measurements shows the trends as your body composition changes. It makes your workouts more efficient, because you can understand (by the numbers) what exercises are definitely good or bad for you.

Does it measure hydration?

AURA Strap 2 measures how much water you have in your body with the help of bioimpedance analysis.

Does AURA Strap 2 fit my wrist?

Each device comes with 4 sets of Infinite Loops.

The set for 38/40/41mm Apple Watches includes XS, S, M, and L Loop sizes and fits 130–200mm wrists.

The set for 42/44/45mm Apple Watches includes M, L, XL, and XXL Loop sizes and fits 140–220mm wrists.

You can pick the size and tightness according to your preferences!

Can I share AURA Strap 2 with a friend or family member?

With the "Guest" feature, you can let your friend or family member take a measurement. It won't affect your progress data.

Is it waterproof?

AURA Strap is water resistant. The device will not be affected by high moisture or immersion in water up to 50 cm / 20 inches, but the device may suffer from direct exposure to a high-pressure water stream. We do not recommend swimming or using the device in the shower.

How are AURA Strap 2’s electrodes made?

The electrodes on each side of the device are made using medical stainless steel (contains nickel).

How long does it work on a single charge?

AURA Strap 2 works for up to 6 months using a standard, replaceable round coin battery (CR1632). Simply change spent batteries with the included pick, and it's ready to use.

Is it safe to use AURA Strap 2 with a pacemaker?

No, we don't recommend using the device with a pacemaker.

Can the AURA Strap 2 detect medical conditions or illnesses?

No, the AURA Strap 2 is not designed to detect or treat any medical conditions or illnesses.

How does Strap 2 connect with Apple Watch? Is it secure?

Strap 2 uses a BLE 4.2+ interface to transfer measurement data. Data transferred between devices is encrypted. The reliability of Bluetooth reduces the number of unsuccessful measurements by 99.99% and allows users to take measurements in any environment.

I have a tattoo on my wrist. Will it affect how Strap 2 works?

No, Strap 2 will function properly regardless of tattoos or skin conditions such as bruises or scars.

Can I export my measurements data?

Yes, you can export your data in a CSV file. This allows you to easily transfer and analyze your data in various applications such as Microsoft Excel, Google Sheets, and other spreadsheet programs.

  • Compatibility

    AURA Strap 2 works only with Apple Watch Series 3 or newer, including SE and Ultra. Supports HealthKit Companion app for Apple Watch.

  • For everyone

    Uniquely designed stainless steel contacts for hairy and/or dry hands.

  • Features

    Body composition measurement and tracking. It measures the percentage of fat, muscle, protein, lean mass, and water in your body.

  • Up to 6 months of hard work

    Single standard, replaceable CR1632 round coin battery (included).

  • High water resistance

    AURA Strap 2 has a waterproof enclosure, allowing it to submerse in water up to a depth of 20 inches (50 cm).

  • Signaling

    LED indicator to show current status.

  • Stays up-to date

    The firmware can be upgraded by the user as AURA continues improving the software for better accuracy and faster measurements.

  • What’s Included

    AURA Strap 2 with battery, Infinite Loops in M, L, XL and XXL sizes, pick for battery and loop replacement, quick start guide.

  • Dimensions

    AURA Strap 2 comes in two sizes: for Apple Watch 38/40/41 and for Apple Watch 42/44/49.

  • In/Out

    Reliable Bluetooth Low Energy 4.2+ protocol.