Features: One Button Process: The breathable is extremely easy to use. Simply insert the three AAA batteries(not included), press the power switch for 1 second to turn on the alcohol tester. Perform a 10-second warm-up, inflate into the breathing haler for 5-10 seconds, the blue backlight LCD screen shows the test result directly. The third measurement is most accurate. Portable Design: The alcohol analyser with mini size, small enough to maintain in your car, purse, backpack or briefcase, so you can not take anywhere. High Accuracy Sensor: Alcohol tester with advanced semiconductor sensor technology, you get the accurate alcohol concentration in the blood and then judge whether it can drive or not. 3 Units Of Measurement: There are 3 units to choose from, percent BAC, BAC, mg/l, if after drinking, it is recommended to wait 20 minutes before it has created a test, it is because 20 minutes for alcohol blood from the digestive organs. Please wait at least 3 minutes to start the next test after the last test. Package Included: 1pc x alcohol tester, 5pcs x mouthpiece, 1pc x english manual, 1pc x storage bag. Specifications: Type: Alcohol Tester Material: Plastic Color: Black Size(L*W*H): About 112x61x29mm/4.41x2.4x1.14inch Battery: 3x AAA Battery(not included) Package Included: 1pc x Alcohol Tester 5pcs x Mouthpiece 1pc x English Manual 1pc x Storage Bag Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.