A:Answer Bluetooth can't travel through water. You'll be unable to use your smartwatch to pair the JBL Endurance Dive while swimming. This model features an MP3 player, which allows you to listen to music underwater without using Bluetooth. Furthermore, it also has a function lock, which prevents water from activating functions inadvertently. For more information, check out our Quick Start Guide here: http://bit.ly/2vf7WXj