The gym won't make your Samsung Galaxy S6 stronger, but Mophie's Juice Pack phone case does, and it adds battery power too. This sleek, light, yet powerful case offers more than twice the amount of battery power your phone has by itself. Charge Vault Technology works with Digital Power Management to prevent harmful overcharging, and a Triple Test Certification ensures unmatched capacity, efficiency, and long lasting quality. Mophie built the Juice Pack with ultrasonic technology for long lasting durability. Pass throughs for headphones, charging jacks, and all the buttons on your Galaxy that let you use your smartphone through the Juice Pack like the case wasn't even there.