The Pavlok 2 bracelet is a habit conditioning device that is available on Amazon for $199 USD.
The wearable might be a good solution for those who want to limit the intake of unhealthy fast food but have trouble doing so. Tied to a mobile application, the Pavlok 2 bracelet sends an electric shock with the power of 350 volts every time the user "exceeds the fast food consumption limit." In conjunction with the classic Pavlovian conditioning experiment, such a product might bear results as it prompts the user to associate bad habits with bad feelings like the unpleasant sensation of the shock.
The habit conditioning device can be customized to help stop compulsive behavior in other instances too. For example, one can tailor the bracelet to zap when too much video games are being played.