Uritc 2800Ah External Rechargeable Battery Case Pack Charger Power Bank Backup Case For 4.7 inch iPhone 6 (Black) Built-in Battery Backup gives you an extra 2800mAh Use a breakthrough rechargeable lithium polymer battery, much safer than lithium-ion battery Integrated power switch allows you to put the battery case in standby mode, built in short circuit, over-charged and temperature protection High quality material protect your iphone, Charging and protecting 2 in 1 4 LED lights indicate the charging mode and current battery life