Kate Spade New York - Portable Backup Battery Bank with Gold Stripe Design, 4000mAh Compatible with most USB-powered cell phones To keep your phone charged and ready for use. Rechargeable 4000 mAh lithium-polymer battery along with a 2.1-amp output provides rapid power replenishment while you're out and about. 4 LED indicators keep you apprised of the battery's status. Compact design enables easy storage and portability. Offer includes one portable battery with micro-USB cable.