- Bluetooth wireless allows you to stream high quality music through a full 8 hours without the worry of messy wires interfering with your workout. In just 10 minutes, you can power your headphones for an hour of use - Note: Bluetooth does not work under water. Songs must be downloaded to the built in MP3 player for headphones to work while swimming - Thanks to the on-board 1GB memory, you can easily store and access more than 200 music tracks directly from your headphones - Secure fit ear hook design, which automatically turns the power on/off when putting on or taking off the earphones - Featuring IPX7, the JBL Endurance DIVE are designed to be used while swimming and in all weather conditions. Durable and made to last, no matter the elements