On The Go Power Extender Pen for any Smart Phone and GadgetsOn The Go Power Extender Pen for any Smart Phone and Gadgets. Charge your phone, tablets,camera,mp3 player, a smart watch and much more. Charge c just about any device that can use a USB port to charge it. The smallest power extender and a Pen has 1200 mAh battery that will give you enough power to extend your phone charge for six more hours. It has a USB port that will allow you to plug your charging cable directly to the pen. It also works as a