A:AnswerOur JBL UA Flash Sport wireless requires for the right earbud to be turned on so they can play on both ears at the same time. The left earbud is mainly depended on the right(primary) earbud. If you need more help, please contact us here: https://bit.ly/2zwFkYM
A:AnswerOur UA True Wireless Flash is not recommended to be used while swimming underwater. We can recommend our JBL Endurance Dive. Since Bluetooth can't travel in water, our Endurance Dive has a built-in 1GB memory that allows you to store MP3 songs.It also has the touch-lock technology which locks the control panel so it will not be disrupted. Note: It is IPX7 rated meaning it can withstand being submerged in water in 1 meter/ 3 feet for 30 minutes.