October 2008. An evening out with friends in ChengDu, China. The mobile phone rings just once , then stops… Tang Zhi Gang saw that his home security system had automatically dialed his mobile, signaling that an alarm had been triggered. “I immediately called the guard to check it out, but I was wondering why my mobile only rang once,” recalls Mr. Tang. What he learned after returning home, made him glad that he’d had a PowerMax security syst

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