Meet the Swimbot: a smart tracker that fits under your swim cap and uses bone conduction technology to play audio. It has high quality sensors and a motion tracking software to make sense of your moves and give you feedback. You can synchronize the device to your smartphone via Bluetooth.
Swimbot lets you share and compare your performances. The device is waterproof and has a 1000 mAh battery. More information is available on Indiegogo.