Inclusion Criteria:  Is age 18-75 years at time of screening Has a clinical diagnosis of type 1 diabetes for 2 years or more as determined via source documentation Pump therapy for greater than 6 months prior to screening Real-time continuous glucose monitoring (RT-CGM) experience greater than 3 months prior to screening Must have a minimum daily insulin requirement (Total Daily Dose) of greater than or equal to 8 units Is willing to perform ≥2 fingerstick blood glucose measurements daily Is willing to perform required sensor calibrations Is willing to wear the system continuously throughout the study If subject has celiac disease, it has been adequately treated as determined by the investigator If the subject has had any of the following cardiovascular events more than 1 year prior to of screening: myocardial infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting, transient ischemic attack, cerebrovascular accident, angina, congestive heart failure, or ventricular rhythm disturbances they should be cleared by a cardiologist prior to participation, if deemed necessary by the investigator. If the subject has had any of the following cardiovascular events within 1 year of screening: myocardial infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting, transient ischemic attack, cerebrovascular accident, angina, congestive heart failure, or ventricular rhythm disturbances, they should be cleared by a cardiologist prior to participation. Is of legal age and capable of providing consent Is fluent in speaking, reading and understanding English  Exclusion Criteria:  Has a history of 1 or more episodes of severe hypoglycemia, which resulted in any the following during the 6 months prior to Screening:  Medical assistance (i.e. Paramedics, Emergency Room (ER) or Hospitalization) Coma Seizures Has been hospitalized or has visited the ER in the 6 months prior to Screening resulting in a primary diagnosis of uncontrolled diabetes Has had Diabetic Ketoacidosis (DKA) in the 6 months prior to Screening. Is unable to tolerate tape adhesive in the area of sensor placement Has any unresolved adverse skin condition in the area of sensor placement (e.g., psoriasis, dermatitis herpetiformis, rash, Staphylococcus infection) Women of child-bearing potential who have a positive pregnancy test at Screening or plan to become pregnant during the course of the study Women who are breastfeeding Females who are sexually active and able to conceive will be excluded if they are not using an effective method of contraception and do not agree to continue using an effective method of contraception for the duration of the study as determined by investigator. Is being treated for hyperthyroidism at time of Screening Has a diagnosis of adrenal insufficiency Is using hydroxyurea at time of screening or plans to use it during the study Is actively participating in an investigational study (drug or device) wherein he/she has received treatment from an investigational study drug or investigational study device in the last 2 weeks Is currently abusing illicit drugs, marijuana, alcohol or prescription drugs (other than nicotine), per investigator judgement Is using pramlintide (Symlin), DPP-4 inhibitor, GLP-1 agonists (as liraglutide (Victoza or other), metformin, SGLT2 inhibitors (as canagliflozin (Invokana)) at time of screening Has a history of visual impairment which would not allow subject to participate in the study and perform all study procedures safely, as determined by the investigator Is diagnosed with current eating disorder such as anorexia or bulimia Has been diagnosed with chronic kidney disease that results in chronic anemia Is on dialysis Is a member of the research staff involved with executing the study.