This dolphin physics balance pendulum fit with 4*AA batteries(not include).It works by electromagnetic principle.It will continue swing back and forward movements until battery finish.When it moves,you will feel cheerful and relaxtion,keep you away from the mental stress or the depression.This dolphin pendulum is an excellent educational & science gadget,children are gonna be very curious about their physics.It’s ideal to be desk decoration of home and office or gift for friends. 6.1″x3.9″x7.7″
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