This open-ear bone conduction headset was created specifically for swimming. There are two modes. the MP3 mode and the Bluetooth mode. With Bluetooth, it could make calls, activate Siri, and control the music on your phone. It may support up to 8G for the MP3. 8GB of underwater MP3 playback capacity and wireless connectivity for your gadgets. Users can more easily hear neighboring voices when talking on the phone or listening to music while wearing comfortable clothing.