The JBL Boom Box 4 is a powerful portable Bluetooth speaker that delivers high-quality sound with 2x40W RMS output. Featuring a built-in power bank, this speaker can be used to charge your devices while on the go. With IP67 waterproof and dustproof rating, this speaker is perfect for outdoor use, and its massive 10,000 mAh battery provides up to 24 hours of playtime. The JBL Boom Box 4 also supports PartyBoost feature, allowing you to connect multiple JBL speakers for an even more immersive sound experience. With its durable design and impressive sound quality, the JBL Boom Box 4 is the perfect speaker for all your outdoor adventures.