Feature: It can be used with Nokia,Moto,Siemens,Samsung,Sony-ericsson Convenient to use in anytime or anywhere ,or answer calls when it is charging. A revolutionary solution, used in Lithium3.6V-4.2V for mobile digital products. Pocket size, fashionable and the Diameter is 21mm ,Length 72 mm(Flashlight shape) High saving power and standby 24 Hours or communicate 100~180Minutes The max charge current is 420mA(Decided by battery quality and model cell phone) 3 import ICs against over-voltage,over-current and short circuit. Technical parameter Designed by One AA battery inside(Alkali ,Carbon, Nickel-Hydrogen Etc) Input Voltage:1.0V~5.5V Output Voltage:DC4.5V-6.0V Input Current: MAX1200mA Output Current: MAX420mA Power convert Efficiency: ≥96%(Decided by battery quality) Standby current power: <1mA