Nchekwa na nchekwa bụ ihe kacha mkpa n'ụwa nke na-eme ngwa ngwa taa. Ma n'ebe ọha na eze, n'ebe ọrụ, ma ọ bụ n'ebe ọ bụla ọzọ, inwe usoro nkwurịta okwu a pụrụ ịdabere na ya dị oké mkpa iji hụ na ọdịmma onwe onye. Ningbo Joiwo factory emi odude ke Yuyao City, Zhejiang Province, ghọtara mkpa a na-enye keukwu nchekwa na.ekwentị nchengwọta nkwurịta okwu.Ụdị usoro ndị a mejupụtaraigwe mbuli elusistemu,ekwentị ụlọ dị ọchausoro,ekwentị ụlọ akụusoro, ụlọ ọgwụ ekwentị usoro, intercom ekwentị usoro, wdg.