In a security-conscious society like Singapore, digital door locks offer enhanced security, convenience (keyless entry), and modern aesthetics. They eliminate the risk of lost keys and can provide features like PIN codes, access cards, and biometric entry.  You’ll need expertise in installing various types of digital locks (e.g., Samsung, Yale, Hafele), understanding different door types (wooden, metal gates), and ensuring proper alignment and functionality. Offering consultation on the best lock for their needs and demonstrating its features post-installation will be valuable.