Chitetezo ndi chitetezo ndizofunikira kwambiri m'dziko lamakonoli. Kaya m’malo opezeka anthu ambiri, kuntchito, kapena malo ena alionse, kukhala ndi njira yolankhulirana yodalirika n’kofunika kwambiri kuti munthu akhale ndi moyo wabwino. Fakitale ya Ningbo Joiwo yomwe ili ku Yuyao City, m'chigawo cha Zhejiang, imazindikira kufunikira kumeneku ndipo imapereka chitetezo chokwanira komanso chitetezo chokwanira.foni yachitetezonjira zoyankhulirana.Machitidwe amtunduwu amapangidwa nditelefoni ya elevatordongosolo,foni yapachipinda choyerandondomeko,foni ya bankisystem, foni yam'chipatala, ma intercom telefoni, etc.