Zefal smartphone charge bike bag lets you store, use and charge your phone all at once. USB compatible, containing a rechargeable and removable battery so you can charge your phone while you ride. Constructed of durable weather-resistant materials. It has a large touchscreen-compatible window on the top of the bag, so you see your phone and still utilize your touchscreen functions. There is an elastic strap on the bottom of the bag that holds the included 2000mah lithium-ion rechargeable battery in place. A convenient headphone port allows you to easily connect your headphones to your phone. There is ample room to also store your keys, wallet, and snacks. USB compatible, removable and rechargeable Bonus rechargeable battery Charge your phone when you ride Easy instructions and assembly Convenient location for the phone Storage for wallet, keys and snacks Touchscreen compatible Weather resistant materials and zippers Smartphone not included L x W x H : 3.75 x 3.60 x 7.75 Inches