Strap 2
Track fat, muscles, and body water to achieve fitness goals right on your Apple Watch
Buy for $149
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AURA Strap 2 for Apple Watch
AURA Strap 2 brings body composition and water level tracking right to your Apple Watch. Measure how much fat, muscles, water, and many more parameters change over the workout or diet process. Build the body of your dreams with the new Strap.
Set, track, and 
achieve your fitness goals
Choose the body you want, and AURA App will help you build it. Get recommendations and precise analytics on your fitness journey to achieve results faster.
Body composition and water level measurement wherever you are
Open the AURA App on your Apple Watch, then touch and hold the sensors on the Strap 2 for 30 seconds. Measurement data and trends are available both on your Watch and iPhone.

Expert reviews

Finally, a body composition gadget that won’t tell you to just lose weight
Meet the AURA Strap 2, the easiest and best way to unlock new health features from your Apple Watch.
The sensors built right into the Aura Strap 2 add a wealth of body-tracking information that you can’t with the Apple Watch’s default Fitness app.
This Apple Watch Band Can Help You Achieve the Physique of Your Dreams. The all-new Aura Strap 2 can be the key you need for a new look at health and wellness data tracking.
Startup Aura Devices is back with another version of its smart Apple Watch strap that's designed to deliver the sort of stats on your smartwatch you'd usually get from stepping on a set of smart scales.
Measurement accuracy
New AURA Strap 2 shows 95%+ measurement accuracy* in comparison with the industry gold-standard DEXA scan.
Powerful AURA App
The convenient and feature-rich app is great for managing your health data and tracking your fitness goals.
Supports your Watch
AURA Strap 2 is compatible with the largest percentage of Apple Watches currently in use, from Series 3 to Series 7.
Reliable Bluetooth connection with Apple Watch
AURA Strap 2 connects to Apple Watch via BLE 4.2 protocol. It provides a fast, reliable, and convenient connection with the Watch.
Full sync with Apple HealthKit
AURA App is fully compatible with Apple HealthKit. All the measurement data syncs with the data hub and is ready to use in third-party apps.
AURA Strap 2 is the only way to measure your total body composition and water level on Apple Watch. It shows your body’s true dynamics, so you can better understand your performance and improve outcomes.
Empower your AURA Strap 2 with additional features and get more resources to achieve your fitness goals. AURA Plus is a service inside the AURA App.
Learn more
Get 6 months of AURA Plus free when you buy an AURA Strap 2
Fits Your Wrist!
The stretchable sport loops for AURA Strap 2 are pleasant to the touch and comfortable for daily wear. They have no clasps! Putting on and taking off your Apple Watch with the Strap 2 is quick and easy.
Every package includes 4 sets of straps of different sizes to fit any wrist size.
Buy for $149
You don’t need to change the round coin battery (CR1632) for up to 6 months of daily use
Changing the battery is easy as 1-2-3 with the included pick or a credit card.
AURA Strap 2 helps you build your dream physique
Millions of people worldwide fail to achieve their fitness and wellness goals. Why? They don’t know the numbers! The most common cause of failure is being in the dark about what body composition is your starting point and what characterizes your dream physique.
AURA Strap 2 is your unique opportunity to check body composition anytime and anywhere on your Apple Watch. Know the path to your goal!
Water resistance
AURA Strap 2 is sweat resistant and safe to wear during shallow-water activities like swimming. However, do not submerge it in deep water, expose it to strong jets of water, or keep it underwater too long. Harsh soap and chemicals might damage the device.
Here are some of the most essential facts to know about the AURA Strap 2 before you buy.
Supports Apple Watch Series 3 and above, including SE. Synchronizes with the HealthKit Companion app for Apple Watch
For everyone
Uniquely designed stainless steel contacts for hairy and/or dry hands
Body composition measurement and tracking. It measures percentage of fat, muscle, protein, bones, 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 complies with WR-50 water resistance standard
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
AURA Strap 2 comes in two sizes: for Apple Watch 38/40/41 and for Apple Watch 42/44/45
BLE 4.2+
Strap 2 vs. Strap 1 comparison


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 7, including SE. It connects with 38/40/41 and 42/44/45 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!
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 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.
AURA Strap 2 is compliant with the WR-50 water resistance standard. What does that mean?
Just like Apple Watch Series 7, AURA Strap 2 can survive up to 50cm/20" of water. This means you can wear it in places like swimming pools and even in oceans. It is safe to take baths with the device on.

However, Apple and AURA Devices warn against using the Watch and Strap 2 in high-velocity water such as hydromassage pools and bathtubs, and during water-skiing, surfing and similar activities. We do not recommend using the device in the shower.
WARNING: Older generations of Apple Watch, while compatible with the Strap 2, might have lower water resistance. Please follow your device’s manual when using it near water.
How does AURA Strap 2 compare to Strap 1
AURA Strap 2 is an evolution of the first generation. The scope of change encompasses a wide variety of improvements from design tweaks to technology shifts, bringing user experience to whole new level.
Faster, easier, and more accurate measurements
The second generation’s new architecture provides 20 times more data points than the first generation could collect, this improves the accuracy to the level of clinical-grade devices.

Strap 2 uses a low-energy Bluetooth connection instead of a sub-ultrasonic interface, which was used in the first generation. It reduces the number of unsuccessful measurements by 99.99% and allows users to take measurements in any environment.
Improved design
Strap 2 housing is slimmer by 20% and narrower by 5%. It’s smaller, slimmer, and feels no bigger than a buckle on a watch strap.

Added an LED indicator to show current device’s status

Easier to open: no more screws

Easier to replace the straps
AURA App 2.0 brings new features and experience to users: fitness goals, Biogram, monthly reports, personalised workout plans. Learn more about AURA App and AURA Plus features.

The new architecture makes it possible to keep the firmware up to date for a long time, bringing new features for a better experience.