VanBox Thunder D2 15000mAh Dual USB Port Power Bank Portable External Battery Charger for iPad Air Mini, iPhone 6 5S 5C 5 4S, Galaxy S5 S4 S3 Note 3 Note 4, Nexus, HTC, Motorola, LG and more (Aluminum, Silver) Ultra-High Capacity and 93% converting efficiency, charges your iPhone almost 7-8 times, large-capacity phones like the Galaxy S4 4-5 times. Dual USB output: 5V / 3.9A (5V/2.4A + 5V/1.5A), the world's leading innovative output solution, charge your two devices at full speed simultaneously. Built-in smart IC will detect the device plugged in and supply appropriate charging current, compatible with almost all 5V USB-Powered devices including Apple iPhone, Samsung, HTC, Google, Blackberry, Tablets, Cameras and Game controllers. Non-Memory effect, Grade-A battery cells, battery capacity hardly decrease after 500 times charge-discharge test. Compact and portable design, fits easily into your bag or pocket.