Previous research revealed that many of the students are unfamiliar with AI, fear it, or do not know the concept of AI itself. In this study, AI speakers, one of the currently commercialized AI technologies, were used by third graders of elementary school, and changes in AI acceptance were studied through pre- and post-surveys, participatory observation, and in-depth interview. As a result of using AI speakers throughout school life for 100 days, students felt the usefulness and ease of the AI speaker, and their willingness to continue using AI technology was augmented. Based on the analysis of the study, the use of AI speakers in the educational field can be seen to have positively changed students' acceptance of AI technology, suggesting that students should be provided with opportunities to experience various AI technologies throughout their lives.