The On Call® Extra Blood Glucose Monitoring System offers user friendly features for easier diabetes management at competitive prices. The smart and powerful data management is compatible with the On Call® Diabetes Management Software. Features : Fast and Reliable , Tiny 0.4 µL sample size , 4 seconds to result , Clinically proven accuracy at a hematocrit range of 25-60% , Audible fill detection reduces wasted strips .Easy to Use : User friendly design ; Large display with bold numbers ; Auto code calibration circuitry in every strip ; Convenient test strip ejector ; Premium Features . 5 daily test reminders : Hypo, hyper, and ketone alarms ; 7, 14, 30, 60, and 90 day averaging ; Re-dosing capability within 3 seconds .