Mini portable alcohol breathing device: alcohol tester police accurate with its highprecision semiconductor alcohol sensor, the breath alcohol tester delivers you the most accurate results and beats alarm when too much alcohol is detected.USB rechargeable and durable: with a USB data cable, the alcohol tester is rechargeable. Police accurate alcohol tester with advanced semiconductor sensor, test your blood alcohol concentration more accurately and faster.Automatic alarm function: alcohol test. If the display is more than 0.050% BAC or 0.500% BAC or 0.250 mgL (BrAK), the tester emits an alarm. The results are displayed for 5 seconds and then automatically switched off.Thus, the test goes hygienically you do not need to use the blow pipe (the blow tube can cause bacteria). It will give you a reliable result. 2 units of measurement can be converted (% BAC, g l). Warning before the LCD displayLCD display Blow Blu Ray and portable rear light: ultracompact design, this portable alcohol respirator is small and lightweight and fits very well in your back pocket. With LCD display to see the result clearly, and with 3 colours to remind you whether the result of the alcohol test is safe or not.