Welcome to the world of ULTIMATE EARS. Hear your music like never before with ULTIMATE EARS WONDERBOOM, an easy-to-carry bluetooth speaker with surprisingly big, clear, crisp bass full of beautiful big bass. Even better, with 10 hours of playback and a completely waterproof design, you can take it anywhere. Go from picnics in the park to watching shows with friends; From the beach to the bath and back without missing a beat. And if you need to really change things up, quickly pair the two together to get even more voice. Bluetooth Version-Bluetooth 4.1 ; Plug Type-3.5 mm ; Sound Sensitivity-90 dB