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The Dell black power companion external battery pack with 12000 mAh capacity, offers reliable backup power. It is suitable for use with Ultrabooks, Notebooks, tablets and Smartphones. It has two 4-pin USB type A power output connectors and one DC power jack to connect external devices. The 4-cell lithium ion battery technology provides efficient performance. This compact power solution features five LED lights to clearly display how much power is left. It comes with two charging cables to charge simultaneously a pair of mobile devices.