Introducing the JBL CHARGEBLK Portable Waterproof Bluetooth Speaker – Black with full-spectrum, powerful sound and a built-in power bank to charge your devices. It features a proprietary developed driver and two JBL bass radiators that intensify sound with strong deep bass. Its high-capacity 7500mAh rechargeable Li-ion battery provides up to 20 hours of playtime. The speaker carries a convenient USB charge out to quickly charge your devices, such as your smartphone, so you will never run out of power again. The Charge 4 features a rugged design, IPX7 waterproof rated exterior and comes in a suite of cool colors. Together with JBL Connect+ it can wirelessly link more than 100 JBL Connect+ enabled speakers to elevate your listening experience.