OldShark? Lightweight Bluetooth Speaker Protable Wireless Bluetooth Stereo Speaker with 5000mAh Extended Battery Power Bank 40 Hours Playtime Compatible for iPhone / Android Phones Bluetooth V2.1+EDR Technology,Seamlessly stream and share music, movies, games, phone and conference calls anywhere The speaker is small and lightweight,easy to carry Built-in Li-Ion Rechargeable Battery (5000mAH capacity)for up to 40 hours of playtime. A standard USB jack can be used as a power bank which can charge your phone or other device in emergency Built-in microphone for hands-free speaker phone calling,hands-free speakerphone anwser your calls without delay This product is sold exclusively by Old Shark and registered Trademark by Old Shark. Only buy from Old Shark to get genuine Old Shark products with manufacturer warranty.Any questions, please contact us, we will provide excellent service