Built-in bluetooth speaker connected with your cell phone,you can enjoy your music while biking, hiking in full relax music time! USB Charging Port: Travel Backpack with charging port offering a quick access to charge your phone and other electronic devices like Amazon Kindle devices, iPad, laptop and all other USB devices conveniently and freely.(Portable Battery pack is NOT INCLUDED)No specific battery pack is required. RFID protection pocket protects your personal information from being stolen(e.g. credit cards, passports, and driver's license) by a RFID scanner.