Features: -Built-in high-quality and highly sensitive sensor, stable and interference-free, with high precision. -No need for a mouthpiece, just blow directly, you can blow about 10cm away from the mouthpiece. -Easy to apply, there is 1 button, press and hold the power button to turn on, wait for 10 seconds and blow for 5 seconds, after hearing the beep, the test result will be displayed (the indicator light "off" flashes twice, the beep sounds twice to shut down). -Small size, easy to put anywhere. Comes with a USB cable, allows you to connect to a USB port for fast charging. -Perfect for weddings, parties, festivals or other social events to help you decide if you are ready to drive. .
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