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Who is doppel for?

We’ve all wanted to change how we feel at some point. Perhaps you drink coffee to feel more alert before arriving at work. Or maybe you’ve considered taking up yoga to help wind down at the end of the day. If you want to feel calmer or more focused, then doppel is for you.

When can I use doppel?

You can use doppel any time you want to feel calmer, or when you want to feel more focused. Perhaps you want to stay calm during an important presentation or relax at the end of the day. Or maybe you want to feel more awake during an afternoon meeting or when you’re working towards a deadline. A rhythm close to your resting heart rate is calming, and a faster rhythm will help you feel more focused. Use the app to take your resting heart rate and create rhythms based on your own physiology.

Which wrist should I wear doppel on?

You can wear your doppel on either wrist. doppel should be worn with the metal base pressed against the inside of your wrist, on the point where you would expect to feel your pulse.

How can I adjust the strap?

To adjust the strap size, change the position of the popper before putting doppel on. Choose the hole you want for a snug but comfortable fit, then push the strap down hard over the round top of the popper. To make sure the popper is secure, push the strap around the popper edge, and check the back of the popper is flush against the underside of the strap. You can change the position as many times as you need.

Does doppel monitor heart rate?

No. We take your resting heart rate through the app on your phone and then set suggested rates from that baseline. No need to monitor.

How do I charge doppel?

To charge your doppel, check that the charging contacts on doppel’s metal base and the pins on the charging base will align, then push doppel firmly into the charging base - doppel’s open motor will spin continuously for five seconds once the charging contacts are touching. Plug the USB end of the cable into a standard USB port or power adapter. You should charge your doppel for two hours before connecting with your phone or tablet for the first time.

How long does the battery last for?

Depending on how you use your doppel, battery life will vary. At the maximum beats per minute, 180 BPM, and at the maximum intensity (a strong vibration which can be felt in a busy environment or while exercising), the battery will last for over five hours of continuous use. At a lower BPM and intensity setting the battery will last significantly longer. You can charge doppel using the supplied bespoke charging base in approximately two hours. Please note: You should charge your doppel after periods of non-use of a few days or more to ensure maximum battery life.

How long does doppel take to charge?

doppel takes approximately two hours to charge fully.

Do I need a smartphone to use doppel?

doppel works with a companion app. The app can be installed on a smartphone or tablet. Use the app to take your resting heart rate, create rhythms, edit your saved rhythms, and send a new pair of rhythms to your doppel. doppel stores one pair of rhythms at a time (one low and one high). But once set, you can leave your phone or tablet behind. You can then turn doppel on and off, switch between your high and low rhythm, adjust the intensity of the vibration, and check the battery - all using touch gestures.

doppel syncs with the doppel app on your smartphone via Bluetooth Low Energy. Devices which support Bluetooth Low Energy include iPhone 4s or later, iPad (3rd generation) or later, iPad mini or later, iPod touch (5th generation) or later. For Android, please check your device's manufacturer. The doppel app is compatible with Android (5 or later) iOS (5 or later).

What colors is doppel available in?

doppel is available in black or white with a matching black or white strap.

What’s the difference between the straight strap and the tapered strap?

The straight strap is 20 mm wide and will fit wrists with a circumference between 12 cm and 21 cm. The tapered strap is 14 mm wide and will fit wrists with a circumference between 12 cm and 20 cm. doppel comes with standard (16 mm) spring pins so it's possible to swap the straps for another set at home, or with help from any good jeweller.

Is doppel water resistant?

doppel is water and sweat resistant, which means it is rain-proof and splash-proof. Do not swim with doppel. We also do not recommend wearing doppel in the shower. If your doppel gets wet, dry it thoroughly before putting it back on.

What comes in the box?

Your doppel comes with a bespoke charging cable, protective bag, a spare popper for the strap, and a printed product guide.

How to install the doppel app

Download the doppel app for iOS from The Apple Store or for Android from The Play Store. Just search ‘doppel - set your pace’. The doppel app is compatible with Android (5 or later) iOS (5 or later).

There aren’t any screens or buttons, how do I control doppel?

You can use the app to send a pair of rhythms (one low and one high) to doppel. But once set, you can leave your phone or tablet behind. You can turn doppel on and off, switch between your high and low rhythm, adjust the intensity of the vibration, and check the battery - all using touch gestures.

Studying people’s behaviour guided us when designing doppel’s natural interactions. When people are stressed or nervous they often rub their cuticles or stroke the ridge of their nails. When feeling tired, a squeeze or a sharp tap can help you feel more alert. We took these everyday actions and used them to influence the design.

How do I turn doppel on and off?

Cover the egde of the motor with your thumb for five seconds to turn doppel on or off. When turning on, after three seconds doppel will begin to beat at your slow rhythm. To turn off, cover the edge of the motor and wait for the vibration to stop.

How do I switch between the two rhythms currently on my doppel?

doppel stores one pair of rhythms at a time (one low and one high). When you first turn on doppel your low rhythm will begin automatically. To switch to your high rhythm: double tap your doppel anywhere on the face. To switch back to your low rhythm: sweep your thumb back and forth over the ridge on doppel’s face three times. If you want to change the tempo of your high or low rhythm, use the app to send another one of your saved pairs. This will replace the pair currently stored on your doppel.

How do I adjust the intensity of the vibration?

To increase the intensity of the vibration: Touch your finger at any point on the edge of doppel’s face. Then, holding your finger to the edge of doppel’s face, sweep clockwise all the way around the outside edge of the face. Once you have made one complete circle, continue to sweep clockwise until you reach an intensity you like. If you overshoot, just change direction (keeping your finger on the face) to adjust.

To decrease the intensity of the vibration, follow the steps above but use an anti-clockwise motion.

How do I check how much battery doppel has left?

To check how much battery your doppel has, using the straps as a guide, swipe back and forth across doppel three times and then count the buzzes you feel. Five buzzes = 100% Four buzzes = 80% Three buzzes = 60% Two buzzes = 40% One buzz = 20%.

Does doppel come with a warranty?

doppel comes with a twelve month warranty. For more information view our Terms of Service.

What is your returns policy?

Providing your doppel is not damaged, you have 60 days if you decide that you would like to return it. For more information view our Terms of Service.

Is it possible to exchange my doppel for a different color?

Yes. If you would like to exchange your doppel please email us info@feeldoppel.com. Please include the order confirmation relating to your current doppel and submit the details of the new doppel you would like to exchange it for. For more information view our Terms of Service.

Are my credit card details secure?

We don’t store any of your credit card information (all details relating to payment are handled by our payment processor Shopify) and we will never share your personal information with anyone else.

I don’t live in the USA, Canada or Europe, when will doppel come to my country?

Unfortunately we don't have the capacity to ship outside of the UK, EU and North America at the moment.

Could this be a smartwatch app?

No. We looked into making an app for other devices but they don't currently have the actuator or battery capability. It wouldn't feel right and your smart watch would run out of battery before you had a chance to check your emails!

Could doppel be used by musicians?

Yes! You can set the tempo to a huge number of different BPMs for a silent metronome. It’s not yet possible to sync doppel with a specific track but this is something we’re looking at.

I have a heart condition. Can I use doppel?

doppel doesn’t directly change your heart rate. It works by changing your brain’s perception of your heart rate. A useful analogy is to compare it to music. Upbeat music gets us going, slower music is calming. This isn’t coincidence, we actually entrain to these rhythms - a faster rhythm makes us more alert, and a slower one calms us down. doppel is doing a similar thing but with a beat that you feel rather than one that you hear. Like with music, your heart rate won’t match doppel’s rhythm however if you have a heart condition we do recommend speaking to your doctor first, just in case.

I have an anxiety disorder. Could doppel help me?

We are very hopeful that doppel will be able to help people with anxiety disorders. In our own tests we have seen that doppel is very effective for people who are nervous and stressed. And in controlled scientific tests run by Royal Holloway University London people using doppel were less stressed when put in a pressured situation than those who did not use doppel. You can read more about our research here. We aim to do further tests in the near future.

I'm a pre-order customer and I have a new credit card. How should I update my details?

We don’t store your credit card details. They are saved with our secure pre-order payment processor Paywhirl. If you need to change your card details just drop us an email to info@feeldoppel.com and we’ll send you a link to update your details.

I have moved house since I pre-ordered. How should I update my details?

Drop us an email to info@feeldoppel.com and let us know.

When will my pre-order arrive?

We expect to ship in Summer 2017. Although please be aware that transit times can vary based on your shipping location.

Am I able to cancel my pre-order?

If you change your mind before we ship it is possible to cancel your order. Simply email us at info@feeldoppel.com

I have a question that hasn't been answered.

Get in touch at info@feeldoppel.com and we'll answer your question directly.