StarFive Marvel Portable Charger 2500mAh Ultra-slim Power Bank Built-In 5-pin and Apple 8-pin USB Port External Mobile Battery Pack for iPhone, Samsung (Captain America Big Logo) Unique Design : Marvel Iron Man and Captain America(Marvel Genuine Product Certification). Made a differently two-sided cover design. Capacity 2500mAh, Li-polymer, Charges Galaxy S4 about 70% with Heat Loss and Efficiency factor. Ultra Slim Design for Easy Carrying. Pocket friendly wallet sized portability (3.8x2.5x0.3) LEDs keep you informed of remaining capacity. StarFive Marvel Portable Charger 2500mAh Ultra-slim Power Bank Built-In 5-pin & Apple 8-pin USB Port External Mobile Battery Pack for iPhone, Samsung