Feature: 1. Highly Accurate and Sensitive: This alcohol tester is used to measure the level of alcohol in a person's body. Using a sensitive semiconductor sensor, this portable alcohol tester gives quick results to determine whether you can drive or not. 2. Auto Switch Off Function: Powered by 2 AAA batteries (not included), this alcohol tester will automatically switch off after 5 seconds of completing the test to save power. More than 200 tests can be performed per battery installation. 3. Stylish Keychain Design: This alcohol tester is space saving and light weight and easy to hold and carry. The pocket size allows you to take it with you anywhere and everywhere to ensure safe driving after drinking. 4. Digital LCD Display: This alcohol tester has a large LCD screen with an orange backlight, which is easy to use at night. 5. Audible Alert: The alcohol tester features an audible alert that sounds when the alcohol level in your breath exceeds the legal limit. This feature provides an additional layer of safety, alerting you to the potential dangers of driving or operating machinery while under the influence of alcohol. Specification: Item Type: Alcohol Tester Material: ABS Alarm Mode: Audible Alarm Test Range: 0.00-0.19% BAC and 0.0-1.9g/L Battery: 2 x AAA batteries (not included). Package List: 1 x Alcohol Tester4 x Accessory1 x Instruction Manual