Build-in lithium-battery: 1500mAh/3.7V Peak power supplied by photo cell: 0.5W/(optional 0.8W) Input: DC/5V500mA Output: DC/3.5V/5.5V/6.5/9V Â2600mA switch on-off for DC output Out size: 105(l)*61(W)*15(H) mm Charging time for build-in battery: 8~10 hours by solar energy, and 2~3 hours by AC adapter. Used for charging of all digital products such as MP3, MP4, PDA, Mobile-phone, etc. of which voltage is 3V-9V.