Tripp Lite UPB-10K4-S2U Power Bank - For Digital Camera, USB Device, Mobile Phone, Tablet PC, Mobile Device, Handheld Device, e-book Reader, Smartphone, MP3 Player - Lithium Ion (Li-Ion) - 10400 mAh - 2.40 A - 5 V DC Output - 5 V DC Input - 2 x - Black: