The Asus Zenpower is a very compact power bank similar to credit card size.The anodize aluminum finishing makes it easy to hold & grip as it minimizes fingerprint marks. Without further ado, it is powerful enough to charge your phone or tablet up to 5 times per cycle with built-in 10050mAh battery cell & features fast charging port at 2.4A that can cut down half your device charging time. Whether you are a social media fanatic or a busy executive who wants to juice up your battery draining smartphones, this gadget in a form of a portable battery pack is a must-have.