Features: 1) Designed by using one primary battery; also can use one rechargeable battery 2) Portable electronic device powered by single lithium battery 3) Charging current: 310mA maximum (changeable by various conditions); add 240mAh to mobile phone battery per AA battery 4) Outward appearance: small and exquisite 5) Automatic shutdown when primary battery is depleted 6) Typical transformational efficiency: 93% 7) Wherever you are, even if there is no alternating current, you could charge your cell phone, digital equipment 8) After charging 30-60min, the charger could transfer the power from the single AA battery to mobile phone battery. Then your phone will keep waiting about 24 hours or talking 100-180mins. Over voltage protection for the circuit and your mobile phone 9) Special designed, modern style, small size, and portable 10) One AA alkaline battery or NI-MH rechargeable battery could be used for charging the mobile phone 11) Have CE, FCC, RoHs certification quality standard to ensure your cellphone, iPod, digital products\'\' normal life 12) Can be used with reassurance