Here is a smart wearable system that helps swimmers listen to their coach in the pool. The FINIS Swim Coach Communicator sends the coach’s voice to the swimmer’s ear using a Bluetooth signal from a smartphone to a receiver worn by the swimmer. It is waterproof up to 3 meters.
The FINIS Live mobile app is compatible with iOS/Android devices. It lasts up to 6 hours and delivers the sound with bone conduction.