The Boulder 100 Solar Panel is composed of two Boulder 50 Solar Panels chained together (for a total of 100 watts) and connected by a hinge and both are built with strong tempered glass and an aluminium frame with added corner protection for ruggedness and durability. It comes with an integrated kickstand that sets the panel at the optimal angle to the sun and a protective canvas bag. It does not hold a charge and is best used with medium to large Goal Zero portable power packs or stations to charge your gear day or night.