Model Numbers: HC019-PWH, HC019-PBK Product Size: Approximately 19.4 x 17.6 cm Main Materials: ABS resin, polypropylene Weight: 249g Input: DC 5V/1A Output: 1.2A Battery Capacity: 4000mAh (2000mAh x 2) Maximum Usage Time: Approximately 9-11 hours Quality Standards: GB4706.1-2005/GB4706.27-2008 I'm selling this because I haven't had much opportunity to use it after purchasing it. It has been used only a few times, so the condition is good. Please refrain from purchasing if you are concerned about minor details, as this is a used item. If you are interested in purchasing, please leave a comment.