NOTE: To charge your phone, you must prepare a portable power bank, then connect your own power bank to the built-in charging cable inside, please note the power bank is NOT included. Specifications: Material: Waterproof Polyester Shoulder Straps: Adjust from 16.5″ to 29.9″ Applicable: Unisex What You Will Get: 1 x Backpack with Combination Lock 1 x Built-in USB Cable Inside 1 x Built-in Audio Line Inside NOTE: Any other items in the photos are NOT included! Combination Lock Operating Instructions Open the lock (The original number is 0-0-0). Push the adjusting to the direction of the arrow. Turn the figure wheel to the secret code you need. Please remember your code. Turn the adjusting sheath to primary place. The secret code goes into effect.