PowerCasewithBuilt-InRechargeableLi-IonBatteryforiPhone4G*Theforiphone4GpowercaseismadefromATLPolymerlithium-ionbatterycellwhichisthebestqualityoftheworld.(ATListhemanufacturewhoproducebatteryfor iphone.)*1800-2400mahandkindsofbatterycapacitylastforaverylongtime.ThecellsuseaUSBportforiPhonecharging,noneedtogetitout,justchargedirectlycharger,andtheappearanceisnobleandfashionable.*Coloravailable:blue+black,green+black,orange+black,fullblack,fullwhite,andcustomizedcolorsareavailable.*Giftboxinclude:foriphone4Gpowercase,USBdatacable,manual.SpecificationsBatteries:lithiumionpolymerbatteriesOutputvoltage:DC5VOutputCurrent: 700mA(0.7A)Inputvoltage:5VInputcurrent: 1000mA(1A)Capacity:1900mAh(1200mAh,2400mAhchoice)Chargingtime:4-6hoursCycleLife: 500Operatingtemperature:-10℃-40℃Storagetemperature:-20℃~+50℃Bodyproduct:125 62 18(mm)Weight:68gStandbytime: 450hoursTalktime:3Gnetworkmorethan8.5hours/2Gnetworkofmorethan15hoursInternetaccess:3Gnetworkmorethan8.5hours/Wi-Fiover10hoursMusic:morethan36hoursVideoplayback:over10hours