The Sony Smart B-Trainer is, in the words of Gizmodo, "a Walkman that tracks your every move". The "B" stands for "beat", since the trainer measures your heartbeat via a sensor behind the right ear.
But the "beat" is also musical, because this wearable trainer device can store music on top of a fitness plan. Listen to your tunes as you train and keep track of your progress: all in one compact device. Run to the Rhythm, as Sony says.
Via an Android and iOS app, the device syncs with your phone so you can see how far you have walked or run, your calorie burn-up, and your heart rate. The Smart B-Trainer selects and plays music with a tempo according to your heart rate and how fast you are running.
The Smart B-Trainer is also waterproof and super lightweight, plus comes in a choice of four colors.
The Sony Smart B-Trainer features: