This literature review examined empirical research conducted between 2004 and 2014 regarding 1:1 technologies in K-12 educational settings. Our overarching research question was: What does research tell us about 1:1 technology in K-12 classrooms? We used the constant-comparative method to analyze, code, and induce themes from 46 relevant articles. Findings showed that the studies selected for analyses primarily concentrated on the following themes: effects on student achievement, changes to the classroom environment, classroom uses, effects on learner motivation and engagement, and challenges to classroom integration. In this article, we define each of these themes, describe the implications of the use of technologies on a 1:1 basis in classrooms, and offer suggestions for future research.