Maximize Your Mobile Experience This durable, ultra-slim case enclosed a maximum capacity 3500mAh battery core, with the ability to double the lifespan of your iPhone7 Plus battery life for some series extra hours. The Joyroom battery case has fully functional set of features including LED power level indicators so you can check power remaining at any time, and pass through syncing so that you don't need to remove the battery to sync with iTunes. Go Further With Joyroom Protection and Power Experience your iPhone7 Plus in a whole new way. The best part of the Joyroom iPhone 7 Plus Portable Charger provides your iPhone with premium protection against the wear and tear of everyday living, while it is still keep its minimal form factor. With its light-weight, simplest bumper design, the Joyroom does an outstanding job to extend your time to rock, talk, and protect your iPhone.