High Accuracy Breathalyzer Sensor: You can get the accurate blood alcohol concentration with the upgraded high sensitivity semiconductor sensor in seconds. Breath alcohol tester with backlit LCD display for easy viewing of the test result at night. Intelligent alarm function: According to different traffic laws in European countries, you can set the alarm value by yourself (0.20 BAC / 0.30 BAC / 0.50 BAC / 0.80 BAC). the buzzer sound prompt if your alcohol level exceeds the value you set. One Button To Test: Semiconductor Breathalyzers is easy to use. Simply insert the batteries 2x AA batteries are required (not included) and press the power button to start the test. 6 replaceable mouthpieces: This alcohol tester comes with 6 replaceable mouthpieces which can be cleaned and recycled. Alcohol Tester is small enough to keep in your car, purse, backpack or briefcase. especially we prepared a portable velvet bag in your car and a perfect gift for your friends. Product Portable electronic breathalyzer with digital LCD screen. Operation steps: 1. After drinking and waiting 20 minutes, start drinking. test 2. Gargle with water or carbonated drink before the test 3.Install the 2*1.5V AAA battery (not included). 4. Remove the mouthpiece from the back cover. 5.Install the mouthpiece. 6. press the button, warning 15 sec. 7. blow for 10s, display the numeric volume quickly. 8. Read the test result on the LCD screen. RESULTS FAST AND VERY ACCURATE Designed to using a system of sensors to ultra-sensitive semiconductors, our portable electric breathalyzer lets you know if you have exceeded the legal blood alcohol limit and issues an automatic alarm if you have exceeded 0.05% BAC h4 class=a -spa