1,sufficient capacity 2, colorful 3, for ipad,iphone,ipod, Nokia, gps,camera 4,used in emergency 5,easy full charge Specifications:Capacity:2200mAhinput Voltage:5v+0.5vDC(or 5v-0.5vDC)output Voltage:5.4v+0.05vDC(5.4v -0.05DC)input Max Current :500mAOutput Max Current :700mADimension:130 30 35 mmWeight:80gabout our factory and company :we are the factory that product the scanner , speaker ,battery ...