Summary: Technology World with Dr Ka Fung: Wifi is indispensable in many households and Wifi connectivity can be affected if your router has not been upgraded for a while. KK explains how a dual-band router can solve your wireless woes. (家中的 Wifi 網絡經常出問題，速度又不理想，可能路由器要更新了。請聽 KK 講解「雙頻段路由器」的功能。 Our Technology World 網站鏈結 www.kkfung.one)
