Device Overview: It is a portable, handheld digital alcohol tester featuring an LCD display for showing results. Battery Installation: The device requires 3 AAA batteries, which are inserted by opening the battery compartment at the back. Functionality: It utilizes an advanced semi-conductor oxide sensor for rapid alcohol level detection, with results displayed within seconds. Usage Caution: While providing a good indication of alcohol levels, it should not be solely relied upon for legal purposes due to potential rapid changes and variables affecting accuracy.