Black & Decker CP120B 20-Watt Power Backup Battery Pack Compact, portable, rechargeable power fits in pocket 3.15 by 5.75 by 1 inches; less than 1 pound 20-watts to power/recharge AC and USB appliances Power and simultaneously recharge small personal electronics on the go Rechargeable Ni-MH battery using AC adapter Travel bag included: holds batery pack and adapter