-Sensitive semiconductor sensor accurately displays blood alcohol level we in seconds. -Red backlight makes it easy to read even at night. - Automatic calculation of the energy saving mode alarm function: if the measurement result exceeds 0,5 ‰ BAC, the breathalyzer will alert you with an acoustic alarm. The LCD screen will display the message "Red light" and will emit an alarm sound indicating "di". -The breathalyzer will turn off automatically 5 seconds after the test to save energy. It also has a battery level indicator. -Has a portable case, which is ideal for storing breathalyzer and mouthpieces. Tester with 12 mouthpieces Professional portable with LED Automatic alarm function HOW TO USE? 1 Press and hold the power button for approx. 2 seconds. 2 After pressing, the preparation cycle begins approx. 150 seconds. 3 After completing the preparation cycle, the inscription BLOW is displayed - indicating that the device is ready for use. 4 Blow continuously for about 5 seconds. The blowing time determines the signal. So you have to blow constantly until the signal is interrupted. 5 After the signal stops, stop blowing and wait a few seconds for the result. 6 The result of alcohol concentration in the body is displayed on the display. Technical data: Kolor: black Size: 12*4.5*2 cm Unit: ‰BAC The package contains: 1x breathalyzer 12x Mouthpiece 1x storage bag 1x packing box