1) Meeting an emergency: Whenever you are, not need alternating current, you could charge your mobile phone in time, and talk when charging. 2) High effect, save resource: Charging 100-180mins, the charger can transfer the resource from the single AA to mobile phone battery. And make the phone keep 24 hours of standby time or talking 100-180mins. 3) Modern and protable: Specially designed, modern style, small size(only bigger than AA a little ), portable. 4) Convenience: One AA alkaline battery or ni-mh rechargeable battery could be used for charging the mobile phone. Safe use a safe stream of power to charge or talk longer on your cell phone.