L button (left button for records query) 2. Middle K button (on/off button) 3. R button (right button for alcohol test) 4. USB Port (connect with PC/charger) 5. Charging indicator (turn green if fully charged) 6. Air inlet (accept breath sample) 7. LED 8. Torch on/off button (with device power off, press torch button to turn on/off torch.) 9. Flashlight button (with device power off, press torch button to turn on/off flashlight)
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