Features:
1. High capacity portable battery charger power bank with 20000mAh be charged for iPhone, for Samsung, MP3/4,PSP Android Phones.
2. Built-in 20000mAh high quality rechargeable polymer Li-ion battery
3. Battery indicator display the accurate percentage of power.
4. Dual USB Outputs DC 5V / 2.1A output charge for Mobile Phones,Tablet,Camera,Speaker etc.
5. Ultra high conversion efficiency (> 80%)
The certified capacity formula is :
output capacity energy=(battery voltage 3.7v*battery capacity 20000mah)*conversion rate/output voltage 5v.
6. Full charging time(AC power): 10-12 hours.