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Nowadays, WIFI is not universally applied in China, people usually use pen drive to transfer files. However, the viruses carried by pen drive are aggressive. In many circumstances, the virus may not be detected by the anti-virus software and can cause huge disaster to our computers. "Guardian Devil" is a pen drive which can visualize the virus. The light, which shaped like the devil's eyes, would turn red when the pen drive gets infected with virus. Once the viruses is removed , the devils eyes grow dark . It can prevent computers from being infected by virus in an appealing way.