Portable Mobile Battery for ipad,mobile phones Type?Capacity:4000mAH A Grade Li-Poly Appearance Material?aluminum?Blue, red, black, silver,Input Voltage?5V 1000mAHOutput?5V 1ACharging Time?4-5 hoursCircle time:?500 times?LED nixie tube show the power?Voltage?current.Size?116*65*10mm Weigh?gApplicable to: iPhone, iPad, other brand mobile Auto Protection function: short circuit, over-current,over-charging, and over-discharging