High Sensitivity and Accuracy: This breathalyzer uses advanced semiconductor technology to ensure an accurate reading in a short time. Quickly assess if you can drive after drinking. Portable and easy to use: this breathalyzer is small and light and fits perfectly in your pocket. You can take it with you when you go to parties, weddings or social events. Be sure to drive carefully after drinking. This breathalyzer is equipped with 5 interchangeable tips. They can be cleaned and recycled, which is good for hygiene. Ideal for drivers. Audible alarm function: the test result is greater than 0.05% BAC or 0.50 BAC or 0.25 mg/L or 50 mg/100 ml, the breathalyzer beeps continuously and reminds the driver not to drive. With backlight, easy to read. Power-saving and auto-off function: This breathalyzer is powered by 3 AAA batteries and will automatically shut off for 5 seconds after the test is finished to save energy. You can test more than 200 times each time you insert the batteries. In addition, this breathalyzer is equipped with a low power indicator (requires 3 AAA batteries, not included, to be purchased separately) TAILLIGHT LCD DISPLAY: The backlit LCD display facilitates night vision and offers professional precision for safe driving. Product Description Product Descriptions Product size: Package size: 103 x 65 x 27 mm Package information: 1 * digital breathalyzer 5 * nozzles 1 * instructions Instructions: Turn on the tester and wait 15 seconds for it to warms up, then run the test and the result will be displayed on the LCD screen for 15 seconds. You can change the units by pressing the key (% BAC, BAC and mg/l)