JBL Charge 4 Portable Bluetooth Speaker Introducing the JBL Charge 4 portable Bluetooth speaker 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.