Nice Grip and Protective Battery Case: Marsno iPhone 7 Plus battery case gives you even longer battery life while offering great protection. A soft elastomer hinge design makes it easy to put the case on and take it off, Slim & Powerful Design: The powerful 4000mAh Li-polymer rechargeable battery can effectively gives you increased 100%+ extra battery life to your iPhone 7 Plus, more talk time, up to 17 + hours talk time, more Internet use, up to 20+ hours on LTE and equipped with power level indicator LED lights, Easy to Use:When your iPhone 7 Plus need to charge, just press and hold the power button on the battery case, your iPhone will then start charging. Lightning cable input, then you can charge your battery case and iPhone 7 Plus simultaneously with your apple lightning cable. Build-in magnetic metal can works great with magnetic car phone mount holder when you’re driving, Advanced Sync-through Technology: The Lightning connector pass through allows you to sync your iPhone 7 Plus to your computer without removing the battery case. 100% compatible with all iOS versions, Apple Pay, and future iOS software updates (Apple CarPlay is not supported).