An antitheft system embodying the invention comprises an alarm unit 2 attached to a commodity for producing an alarm on receiving a detection signal or an alarm activating signal while stopping the alarm on receiving an alarm stopping signal, and a signal generator provided on a cashier's counter for...http://www.google.com.tw/patents/US6043744?utm_source=gb-gplus-share專利 US6043744 - Antitheft system
