Powerful 4500mAh capacity, meet your iPhone emergent use. OISLE’s design, built in lightning port, make your life more easy. Professional Mini Power Bank structure, small size, big capacity. Perfect palm sized mini power bank, perfect hand feeling when battery is low in games. The mini emergency portable battery charger, is special designed for iPhone series, More Thin and Smaller than others types but more useful in your daily life. Forget the heavy with cable power bank for the short trip, put this iPhone battery charger in your pocket or handbag easily. Generally, people just need to fully charge their phones once in a day. OISLE’s design conception is to find a perfect balance between practicability and exquisiteness, and with the best quality.