Speaker JBL Charge 4 is a portable speaker with Bluetooth function, powerful sound and built-in battery for charging devices. JBL's patented speaker and dual woofers deliver clear bass. The powerful 7500mAh Li-ion battery provides up to 20 hours of continuous music playback. The speaker has a convenient built-in USB connector for charging other devices, such as a smartphone. The Charge 4 speaker features a rugged IPX7 water resistant design and comes in several colors. With JBL Connect + technology, you can wirelessly link more than 100 JBL Connect + enabled speakers for more powerful sound.