DIY a mobile power only need to pick a battery-powered input you can output 5V voltage for your cell phone MP3 MP4 PSP charging very simple and convenient; Input voltage: 1~5V; Output voltage: 5.1~5 .2V; Output Current: Rated 1A~1.5A (single lithium) the maximum 1.5A (single lithium); Conversion efficiency: up to 96% (the higher the input voltage the higher the efficiency); Switching Frequency: 500KHz; Output ripple: 30mV (MAX) 20M-bandwidth (input 4V output 5.1V 1A); Working temperature: -40C+85C; Quiescent Current: 200uA; Load regulation: +/- 1%; Voltage regulation: +/- 0.5%; Dynamic response speed: 5% 200uS; Input: IN + input positive level IN-input negative