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In office there always are waste paper, parcel list and document files, which contain important information that can't be leaked and which can't be dealt with and destroyed in time. These papers make desktop a mess. It's inconvenient and inefficient to use traditional shredder as it's big size and not operated so easily, and can't make use of destroyed paper.Grunt's size is like a kaleidoscope.Easy to carry.It shreds when spining, compressing waste paper into a waste paper pie, saving space and left-over.It can also generate power when functioning,charing to USB for other devices. It turns the process becoming a sustainable process.