Inclusion Criteria:  Fasting plasma glucose (FPG) ≥ 7.0 mmol/L [126 mg/dL] or HbA1c ≥ 6.5%. Subjects have had type 2 diabetes mellitus for more than one year Receive oral anti-diabetic agents on a stable dose over the previous 3 months.  Exclusion Criteria:  Under insulin therapy With other acute or chronic health problems Body mass index (BMI) ≥ 40.0 kg/m² Needle phobia or allergy to adhesive plaster Planning to move out from Malaysia within 4 months' Being pregnant, planning for pregnancy or lactating women