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)