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Design: battery case with your headphone via 3.5mm aux Jack adapter to listen to music.Features:Rechargeable battery provides your iPhone 7 up to one more charge when needed.Doubles your iPhone battery power to keep you going through out the day, essential for traveling, camping, road trips or business trips.Slim, lightweight and compact design for portability.The 4 LED indicator displays the battery levels and charge status. Know before you go.Battery case supports 14℉ low-temperature environment workLife-time friendly customer service.Specifications:Capacity: 5000mAh Lithium Polymer rechargeable batteryInput Voltage: 5V=1AOutput Voltage: 5V=1ANote:1.Please fully charge the battery case before first use.2.Please gently slide the phone in and out.3.When charging the battery case with phone attached, the battery case will be charged first. After the battery case is fully charged, charging of the phone battery will begin.KINDLY REMINDER: 1. Slide the phone into the battery case. Make sure that the phone is well connected to the battery case's USB connector. 2. Long press the power button 3 seconds until led lights on to power on and start charging. To stop charging,just long press power button 3 seconds again till the led light off.