Type 1 or type 2 diabetes mellitus adult subjects 18-75 years of age

Inclusion Criteria:

1. Subject is 18 - 75 years of age at time of screening

2. A clinical diagnosis of type 1 or 2 diabetes as determined by the

   Investigator, for a minimum of 12 months duration:

   • Criteria for type 1 diabetes:

     • Required: Age of onset < 40 years of age
     • Required: History of insulin use only for management of diabetes
     • Required: history of normal weight or underweight at time of diagnosis.
     • Not required: Initial presentation of diabetic ketoacidosis.
     • Not required: History of diabetic ketoacidosis
     • Not required: Low fasting C-peptide

   • Criteria for type 2 diabetes:

     • Required: Age of onset ~ 40 years of age
     • Required: History of initial oral anti-diabetic use

     • Required: History of being overweight at time of diagnosis.

       • Type 2 insulin requiring is defined by type 2 diabetes subjects taking insulin with or without oral anti-diabetic agent and may also include: incretin mimetic, pramlintide or GLP agonist
       • Type 2 non-insulin requiring is defined by type 2 diabetes subjects who take oral medications and may also include: incretin mimetic, pramlintide or GLP agonist
3. Adequate venous access as assessed by investigator or appropriate staff

Exclusion Criteria:

1. Subject is unable to tolerate tape adhesive in the area of sensor placement.
2. Subject has any unresolved adverse skin condition in the area of sensor or device placement (e.g., psoriasis, rash, Staphylococcus infection)
3. Subject is actively participating in an investigational study (drug or device) wherein they have received treatment from an investigational study (drug or device) in the last 2 weeks
4. Subject has a positive pregnancy screening test
5. Subject is female and plans to become pregnant during the course of the study
6. Subject has had a hypoglycemic seizure within the past 6 months
7. Subject has a history of a seizure disorder
8. Subject has central nervous system or cardiac disorder resulting in syncope
9. Subject has a history of myocardial infarction, unstable angina, coronary artery bypass surgery, coronary artery stenting, transient ischemic attack (TIA), cerebrovascular accident (CVA), angina, congestive heart failure, ventricular rhythm disturbances or thromboembolic disease
10. Subjects with hematocrit lower than 36%
11. SUbjects with a history of any cardiac arrhythmia, including atrial arrhythmias
12. Subjects with a history of adrenal insufficiency
13. Subjects with migraines