12 interchangeable mouthpieces - breathalyzer equipped with 12 mouthpieces that can be cleaned and recycled. Very compact design, the breathalyzer fits in your pocket and is easy do hold and carry anywhere. Ideal for drivers. Professional alcohol tester - this alcohol tester has a very precise semiconductor alcohol sensor. It can quickly give you a score to assess whether you can drive or not. Test winner with 99,1%, range 0,00% ~ 1,9% BAC / 0,0 ~ 1,9 g / l. EMERGENCY FUNCTION - The test result exceeds 0,05% BAC or 0,50‰ BAC or 0,25 mg / l or 50 mg / 100 ml, the breathalyzer will emit a continuous beep and remind drivers not to drive. Wait 10 seconds for it to warm up, then blow for 5-6 seconds. The result will later be displayed on the LCD screen. The breathalyzer will turn off automatically to save energy when no operation is performed. 1. The test result will be accurate 20 minutes after drinking. 2. A test carried out immediately after alcohol consumption can only show a temporary concentration of alcohol in the mouth. Wait at least 3 minutes before the next test. 3. For a more accurate result, we recommend repeating the test 2 or 3 times. Specifications: Sensor: High precision semiconductor sensor Warm-up time: within 10s Response time: within 5s Display: Orange illuminated 3-digit LCD display Range: 0.00-019% BAC (0.0-1.9g/l) Accuracy: -0.01~ 0.02% BAC (at 0.05% BAC) Operating environmental temperature: 5℃-40℃ Power : Use with 2* AAA batteries (Not included) Auto power off: 10s after the result is displayed Product size: 113x64x26mm Net weight: 35g