<qa>  What is the duration of each study phase?This is a prospective, multi-center, non-randomized and noninterventional post-market release study. Subjects will participate in 2 phases with each phase requiring the subject to use the continuous subcutaneous insulin infusion CSII pump over the course of the study. During the study, subjects and parent or legal guardian will be trained to wear the glucose sensor in the abdominal area for 3 days to transmit real-time RT data to the pump. The duration of each study phase is approximately 6 months. 