JBL Pulse 4 is a Bluetooth speaker with a battery that provides twelve hours of playback and with IPX7-certified casing that is able to withstand brief periods of submersion. It blasts out 360-degree sound and emits LED light in every direction to suit the music. The user can also customise the light show using the accompanying app and choose from preset themes. It is possible to increase the sound volume by interlinking several JBL Pulse 4 units.