Instructions:
Step 1: Insert a mouthpiece into the breathalyzer. Step 2: Press the Power/Mode Button. You will hear a beep and the unit will start to count down from 15 on the DISPLAY and issued with a sound of "Warm up". This warm-up process prepares the sensor. Step 3: When the countdown approaches 2, begin to inhale a deep breath. When the countdown reaches 0, you will hear a second sound of beep indicating that you should blow into the mouthpiece. Blow through the mouthpiece until you hear a beep(within The 10 second countdown). Step 4: Once the sensor has analyzed the breath sample, the estimated value is displayed.