Mini Portable Alcohol Respirator: The alcohol tester takes precise measurements with its high precision semiconductor alcohol sensor, the breath alcohol tester gives you the most accurate results and alerts you when too much alcohol is detected. USB Rechargeable and Durable: With a USB cable, the alcohol tester is rechargeable. The police precision alcohol tester uses advanced semiconductor sensors to test your blood alcohol concentration more accurately and quickly. Automatic alarm function: alcohol test. The tester will sound an alarm if it shows more than 0.050% BAC or 0.500% BAC or 0.250 mg/L (BrAK). The result is displayed for 5 seconds and then automatically turns off. So the test is hygienic - you don't need to use a blowpipe (the blowpipe can cause bacteria). It will give you a reliable result. 2 units of measurement (% BAC, g/l) can be converted. ;LCD Display Front Warning LCD Display Blow Blu Ray and Portable Tail Light: Ultra-compact design, this portable alcohol respirator is small and lightweight, making it a perfect fit in your back pocket. LCD display, the result is clear at a glance, 3 colors remind you whether the alcohol test result is safe or not.