lonlif battery case for iphone 7/8, 4000mah portable protective charging case compatible with iphone 7/8 (4.7 inch) rechargeable extended battery charger case (rose gold) lonlif lonlif ultra slim external protective portable charger battery case is designed to improve the performance and battery life for your iphone 7/8 (4. 7 inches only). always power on, never offline. pros: no excessive bulk perfectly fits your phone original headphones. charge replacement technology, add more than 120% battery life. 100% compatible with all ios versions, apple pay, and future ios software updates. just press the button for one second, then the led indicator will show how much juice is left, one led light means 25% power. use original charging cable to charge your iphone 7/8 and battery case at the same time, as well as sync your iphone to itunes without removing the battery case. when you want to charge your phone through the battery case, please be sure the phone tightly close the bottom of the case, and then press the power button about 3 seconds to start charging. note: carplay is not supported. not compatible with iphone 7 plus or 8 plus. our case is manual, not automatically. press the back button for 3 seconds to start or stop charging. do not carry or use the product when you are participating an activity in extreme environment, like snowboarding, ski, swimming, diving. please use lonlif iphone 7&8 battery case in proper temperature range (under 40°c) and do not put it under heat, source or into any liquid. we recommend that you can use your phone original charging cable and a wall adapter (5v/1a only) to charge lonlif iphone 7&8 battery case. lonlif iphone 7&8 battery case does not support car charger, high voltage or quick charge deployed adapters.