1.open size: 480*460mm
2.fold size: 220*150*25 mm
3.Power: 20W; Output: 18V/1.2A
4.Solar panel:  polycrystalline silicon• High efficiency: 15%~17%
5.Long life span. It is made of high quality solar silicon panel.
6.Easy to use. Put the solar panel in the sunlight directly and connect to the sock. The indicator 7.light of laptop will be red when in use.
8.Convenience. It is foldable and portable.  　
9.Charging time: about 3 to 4 hours (this depends on different kinds of laptops)