The Dell Power Companion lets you bring extra power with you, so you can be more productive. This handy device powers select Dell Notebooks and Ultrabooks, as well as up to two smartphones, tablets or other USB-enabled devices. This compact power solution fits seamlessly into your mobile lifestyle by fitting neatly into your laptop case or bag. The Dell Power Companion is designed to deliver in-bag charging, so your devices are charged when you need them. The compact and convenient Dell Power Companion features an 18,000 mAh six-cell battery that provides reliable power when you're on the go and is easily charged using your Dell power adapter. The Dell Power Companion is compatible with select Dell computers only (with installation of latest BIOS update) Designed For:Dell Inspiron 5555, 5758,Dell Latitude 12 Rugged Extreme (7204), 13 7350, 14 Rugged Extreme (7404), 3160, 3350, 3450, 3550, 7214 Rugged Extreme, E5250, E5450, E5550, E5570, E7250,Dell Venue 11 Pro (5130), 11 Pro (7140), 8 Pro (3845),Dell Vostro 3558, 5459,Dell XPS 13 (9343), 15 (9550) The Dell Power Companion is lightweight and compact, so you can stay powered on-the-go without adding bulk to your bag. The Dell Power Companion is designed to deliver in-bag charging, so your devices are charged when you need them. It's also specifically designed to fit into the Dell Premier Backpack and Dell Premier Briefcases. Two USB charging ports let you simultaneously charge a pair of mobile devices in addition to your Dell notebook.