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

Touch gestures & the app

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. See Using doppel’s touch controls

Studying people’s behavior 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.