Boostcase is a leading premium iPhone battery case brand. The Boostcase patented two-piece modular design includes a protective hardshell case and a detachable battery sleeve. Attach the battery in a simple click when you need it, remove it when you don't. So you have ultimate flexibilty to enjoy the slim form-factor of your iPhone 6/6s without adding bulk. With the Boostcase award-winning patented modular design this is the only iPhone 6s battery case on the market that you can both protect & power your iPhone while also still keeping its minimal form-factor. With the Boostcase iPhone 6 battery case you can add over 100% more battery life. The Boostcase includes a fully functional set of features including charging on/off switch so you can decide exactly when to power your iPhone, touch-activated sensor battery level indication so you can check power remaining at any time, and pass through charge/sync so you dont need to remove the battery to sync with iTunes.