[Features] Personal Digital Breathalyzer: This reusable breathalyzer kit (comes with free carry bag) monitors your blood alcohol level to ensure you are driving or taking a taxi safely! FAST, ACCURATE RESULTS: Designed with a sensitive sensor system, our portable breathalyzer will tell you if the legal limit is exceeded, Disposable Hygienic Tips: Makes it easier to quickly test and dispose without having to share the same tip each time. Easy to use: just make sure the batteries are plugged in, then just connect the mouthpiece, press the start button for an initialization countdown, and finally blow for 3-4 seconds when "blo" is displayed. [product information] Product Name: Car Alcohol Tester Colour: Black Voltage: 3 (v) Size: 120*45*20 (mm) Product weight: about 0.08 (kg) Measurement accuracy: 0.01%BAC Packing list (you can get after purchasing one item): Car Alcohol Tester*1 Please understand: 1. Due to the long shipping time, the item may be damaged during the shipping process, if the item is damaged, please leave us a message through the official website immediately before posting comments, and I will solve the problem for you. 2. Due to manual measurement, the size may have an error of 1-3cm. 3. Colors may vary from monitor to monitor.