This document discusses trends in technology ownership among teens and adults and opportunities for libraries to engage patrons through mobile technologies. It notes that over 90% of teens and 80% of adults access the internet, with high percentages owning smartphones. QR codes are presented as a way for libraries to provide digital content and services to patrons using mobile devices. The document outlines how QR codes work and provides examples of their use, such as creating codes that link to reading recommendations or online library resources. Challenges with QR code implementation like security, technology requirements, and training needs are also addressed.