ACCURATE TESTING(Christmas Gift): This alcohol tester is composed of advanced high-precision nanotechnology sensor, which can accurately feedback your actual situation on top of the LCD display, and can be used with family, friends. It can be used as a New Year gift and Christmas gift for family and friends. PORTABLE BREATHALYZER: The professional breathalyzer is only 126x51x23mm, and weighs only 90g, which is very convenient to carry on the go out and it can easily be put in the bag and car. TIME SAVING AND CONVENIENCE: Environmental protection and energy saving, no need to replace the battery regularly, reduce the pollution of the environment, the device comes with a USB cable allows you to charge in multiple areas, and always observe the power display. Save time cost. EASY TO USE: After you get the product insert the mouthpiece into the mouthpiece insert slot, long press the start button, after the "Beep" sound the product turns on and the screen shows "WAIT" and starts counting down, when the countdown to zero, the screen shows "START", take a deep breath and keep blowing for 5 seconds, then wait a while and the data will be displayed. PERFECT AFTER-SALES SERVICE: If you encounter any problems in the use of the process, please contact us in a timely manner, our after-sales team will provide you with the best quality service to help you solve the problem, customer recognition is our biggest goal.