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In cold winter, in order to get warm ,cats
would stay under the car of which the warm
gas still lingers on,but when car start again
cats are reluctant to leave, which lead to a
lot of tragedies. This product named "The
voice of life " can drive these little animals
away by making use of supersonic waves.
Wuhan Polytechnic University
Nana Hu Yijun Zheng Fang Hu