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Blood sample: fresh peripheral whole blood, venous whole blood Calibration sample: venous plasma Blood volume: 0.6μl Test range: 20-600mg/dL(1.1-33.3mmol/L) Test time: 10s Memory: 200 test results (average value of 7days/14days/28days) HCT: 30-60% Operating Temp Range: 10-40C Battery: 2*AAA battery The steps to disable the voice function as below: In power off state, press ▲ key for 3s, you will see 'So' in display. Press ▲ key to make it at 'SC' in display. Press power key to confirm, then wait for power off automatically. PS: 'So' mean voice function open, 'SC' mean voice function close. How to the date and time？ Press ▼ for 3s in power off state, adjust year correctly and press power key to confirm, then month and day.