HD ACOUSTIC SOUND: Implemented with two 8W total acoustic drivers the Mpow Bluetooth speaker produces a wide audio spectrum. Experience your music in high definition audio and clarity at any listening level.</br>EXTRA-LARGE CAPACITY POWER BANK: Built-in 5200mAh rechargeable battery allows 22 hours playing time and charge your cell phones when in urgent need in outdoor. Enjoy a whole day outgoing on a single charge.</br>ULTRA PORTABLE: Well-protected in rugged iron shell and IPX5 rating material this speaker is shockproof and waterproof perfect for outdoor activities and on-the-go listening. Comes with a pouch and hand strap it??s very convenient to carry this speaker everywhere.</br>BLUETOOTH 4.0 CONNECTIVITY: Connect over Bluetooth in just a few seconds to pair with your device up to 33 unobstructed feet away enables you to enjoy wireless sound.</br>HANDS-FREE CALLING: Built-in mic for hands-free speakerphone cell phone calls over Bluetooth from Smartphones and iPhones.</br></br>Product Description</br></br><p><b>Enjoy Music On the Go!</b><br> <b>Super Large 5200 mAh Power Bank </b><br> With 5200mAh built-in battery?? this Mpow Bluetooth speaker can be used as your emergency power bank for your phone when you???re on outdoor activities. You can use most USB power sources?? like a laptop or car charger.</p> <p><b>Handy and Portable </b><br> Portable and waterproof features guarantee better user experience when playing music in outdoor hiking/biking