Tripp Lite Portable 2-Port USB Battery Charger Mobile Power Bank 10k mAh - For Smartphone, e-book Reader, Tablet PC, Bluetooth Speaker, MP3 Player, Headphone, Headset - Lithium Ion (Li-Ion) - 10000 mAh - 2 A - 5 V DC Output - 5 V DC Input - 3 x - Black