mouthless very accurate made of decent and durable materials LCD display small size, you can take the device wherever you need long battery life convenient USB charging Easy to use Press and hold the power button for 1 second, then you will hear one beep and the breathalyzer LCD display will be turned on. Wait 10 seconds, during this time the device warms up. When the time from 10 to 0 is counted down on the tester, take a deep breath and blow the air into the device for 3-5 seconds. Read the result on the display. An unquestionable advantage of the tester is very simple operation, fast preparation time for work and audible signaling of the start and end of sample reception. The tester is a precise tester with a measuring range (up to 2 per mille) and accuracy up to hundredths of a per mille. It performs quick measurements and is equipped with a very sensitive modernized sensor. Keep yourself and others safe while driving! Have you ever wondered if you can get behind the wheel? Always have a digital breathalyzer with you, which allows you to quickly estimate the concentration of alcohol in the blood from the exhaled air. This unit does not require a mouthpiece and is incredibly efficient!