Build-in lithium-battery: 13500mAh/50w
      Input: DC/13.5V　1500mA
      Output: DC/15V,16V,18V,19V,20V,22V,24V　3000mA

   Used for the power supply of laptop, and its continual working time is two to three hours.

   Optionally, we also can use a SOLAR ADAPTER(XJ-S3C) to charge it up, the charging time is about three hours.