Epic sound. All day long. Made to be the most powerful, portable Bluetooth speaker, JBL Boombox delivers monstrous sound along with the hardest hitting bass. Enjoy music for 24 hours without missing a beat. Imagine playing with your favorite beats from sunrise to sunrise on a single charge. Use the massive 20,000mAh battery and dual charge out to charge your external devices anytime and keep music rocking. Rugged enough to handle your wildest tailgate party, the JBL Boombox is IPX7 waterproof, which withstand any weather and even the most epic pool parties. Switch between indoor and outdoor modes to optimize sound wherever the party is. In addition, if more massive music is a must, you can connect more than 100 JBL Connect+ enabled speakers under Bluetooth range with just one press of a button. Wireless Bluetooth Streaming: Wirelessly connect up to 2 smartphones or tablets to the speaker and take turns playing impressive stereo sound. High-capacity 20,000mAh rechargeable battery: Built-in rechargeable Li-ion battery supports up to 24 hours of playtime and charges devices via dual USB ports. IPX7 waterproof: Take Boombox to the beach or pool without worrying about rain, spills or submersion in water. JBL Connect+: Amplify your listening experience and rock the party by wirelessly connecting more than 100 JBL Connect+ enabled speakers. Sound mode: Enjoy deeper bass and richer sound in indoor mode; switch to outdoor mode for expansive sound with strong bass and longer playtime. Monstrous sound along with the hardest hitting bass: Incorporated four active transducers and two JBL bass radiators, JBL Boombox delivers monstrous sound along with hardest hitting bass that you will not only hear but also see it.