The Juice Pack Ultra is Mophie's most powerful battery case made for the iPhone 6. This sleek and light, yet powerful case boosts your phone's battery by 150%. 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 Ultra with ultrasonic technology for long lasting durability. Pass throughs for headphones, charging jacks, and all the buttons on your iPhone let you use your smartphone through the Juice Pack like the case wasn't even there.