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this laptop coolingbag uses a macromolecular compound for the absorbtion of excess heat,this macromolecular compound remains in granular or crystal format up to temperature of 25 CD. using tips: place a laptop directly on this bag,the pad will absorb large amount of heat from the laptop's base,the granules or crystals will slowly absorb heat and will changes their molecular appearance,forming a viscous gel,this will continually absorb heat and allow any item in contact to dissipate it's own heat output. the laptop coolingbag permit 3 to 8 hours of using time,depending on the ambient environment and amount of heat produced from the laptop,no need any power. advantage: revolutionary fanless design for absolute silence, no need power,get rid of astriction from the wire. exclusiveheatshift technology for ultimate laptop cooling ultra light weight for transportation and carrying,about 830g. long duration of absorbing heat 3-8hours. soft and durable material designed for max portability suitable for all types of laptop computers. can be used as cooling cushion. keep your laptop working at normal temperature to prolong the notebook's life.