iPhone USB Power Bank

How annoying is it when you run out of power? You spend all day on the shoot away from wifi so your phone gets drained. You may be using your iPhone as a back-up or as your primary camera - either way you certainly need to be able to rely on it. For ultimate peace-of-mind, a back up powerbank is the answer. This powerbank is the answer. 

Specs:

Battery Capacity: 15001-20000mAh
Battery Type: Li-polymer Battery
Output Interface: Double USB
Input Interface: Apple Interface
Input Interface: USB Type C
Input Interface: Micro USB
Input Interface: Lightning
Output Interface: 5V/2.1A
Size: 15*7*2.2cm
Weight: 520g