12 interchangeable mouthpieces: Alcohol tester comes with 12 mouthpieces, the mouthpieces can be cleaned and recycled. Super compact design, alcohol tester fits in your pocket and is easy to hold and carry wherever you go. Ideal for drivers.Alarm function: Test result is over 0.05% BAC or 0.50 BAC or 0.25 mg/L or 50 mg/100 ml, alcohol tester gives a continuous beep and to remind drivers not to drive. With backlight, easy to read.Easy to use: Simply insert 2 AAA batteries, turn on your alcohol tester (not included). Wait 20 seconds to warm up, then you can start testing. The alcohol tester turns off automatically to save power when no operation is carried out.Police accurate alcohol meter: The alcohol tester with professional airway design and high-precision semiconductor sensor, test your blood alcohol concentration (BAC) more accurately and faster. Test winner with 99.1%, range of 0.00% ~ 1.9% BAC / 0.0 ~ 1.9 g/l. Easy to use. With 12 different mouthpieces, easy to change and replace, neat and safe.Features:- Made of high-quality material, durable and sturdy, wear-resistant and corrosion-resistant.- Small size, lightweight and portable, easy to carry and store, suitable for both indoor and outdoor use.- With a LCD display, supporting backlight, easy to read.- Support automatic alarm. When it's over normal setting, the tester will send an alarm and you can see the data on the display.- Easy to use. With 12 different mouthpieces, easy to change and replace, neat and safe. Specification:Material: plastic+electronic components+metalSensor: highly sensitive semiconductor alcohol sensorTest Range: 0.0.19% 6BAC (0.1-1.9g/)Accuracy: -0.01 -+0.02% BAC (at 0.05% BAC alarm point)Warm up Time: 10 secondsBlowing Time: 10 seconds (generally 3-5 seconds is better)Reaction Time: