Whenever you are, no need alternating current, you could charge your mobile phone in time, and could talk with others when charging. Charging 40-60mins, the charger could transfer the resource from the single AA to mobile phone battery. And could get the phone keep waitting 24 hours or talking 100-180mins. Special designed, modern style, smail size(size bigger than AA a little only) portable. one AA alkaline battery or NI-MH rechargeable battery could be used for charging the mobile phone. over voltage protection for the circuit and your mobile phone. Smart charge. safe use.Designed for userwith one primary cellMay be used with areargeabie cellDesigned for use with mibileel ectronics powered by single lithium cellCharging current 310mA maximun(waries with usage conditions)Adds up to 240mAh to devices battery per AA alkaline battery Compact sizeEnables immediate usage of device even if battery if fully depletedAutomatic shutdoen primaty battery is depletedTypical efficency 93%