Old address signs are retrofitted, incorporated and integrated with new electronic devices for navigation aid, Internet and IOT (Internet Of Things) related applications. New smart address sign with Internet connections has the capabilities of remote sensing and detecting useful information for residential homes and business offices. Useful information is gathered, stored, processed and relayed for applications of improving home and office efficiency, security and safety related solutions. New hardware and software built into the smart address signs also serve as wireless signal repeating/relaying base stations.