QQ-Tech Stylish 4200mah High Capacity Power Bank for Samsung Galaxy S4 / Samsung Galaxy S IV / I9500 External Rechargeable Battery Pack Backup Charger case with Viewing Stand & Battery Level Indicator (blue) Stylish slim decent & practical backup shell, Kickstand Ideal for watching videos, reading, browsing web; Perfect match for your lovely new Galaxy S4; environmentally-friendly materials, ABS hard case with soft leather Smart cover(your option to choose ) prevent your smart phone and screen from scratches, dust and other damage; Rechargeable power capacity external battery extends the working time of your smart phone; 500+ recharge cycles; Smart LED indicator--indicates charging mode & current battery life and shows charging status at the same time; Short Circuit/Over Charge protection; Input Voltage: 5V, Input Current: 750mAh; Output 5V, 750mAh ; Capacity: 3200mAh/4200mAh; Charging time: about 3.5 hour;