"Power Tube 10000 is a compact and creative portable power bank. It is the combination of classic design and modern technology. Its classic battery shape is a cute compliment to the traditional dry cell appearance. The exclusive battery meter indicator follows the battery capacity, green when charged, orange when partially charged and red when very low. Built-in 10,400mAh, huge battery capacity supports charging two mobile devices simultaneously. Dual female USB ports are used to charge most mobile devices. A micro USB cable is included to recharge the device via any USB powered equipment, and can also be used to charge any Micro USB powered devices via the female USB output. Popular Compatible Models (Included Micro USB cable):Samsung: Galaxy S5 S4 S3 S2 / Galaxy Note 3 2 / Galaxy Nexus / Focus S / Infuse HTC: One (M8), One, One max, One mini / Desire series / Butterfly series Motorola: Moto X / Moto G / Droid : Nexus 5, 4, G2, Optimus 4X, 2X, V, S, T, 3D, 7Nokia: Lumia 1020 920 900 710 800 / N8 / N9Others: Most of Android Phones / Google Glass / Blackberry / Sony Xperia Z1 / PSP / MP3 MP4 MP5 / GoPro Popular Compatible Models (extra cable required but NOT INCLUDED):Apple: iPhone 5S / 5C / 5 / 4S / 4 / 3GS / iPad Air / iPad mini / iPad / iPod touch".