Features: Portable and Convenient Keychain : This mini keychain is lightweight and compact, making it easy to carry and use anytime, anywhere. Accurate and Reliable: Equipped with ASIC chips, this professional small keychain provides precise alcohol testing results for personal and professional use. Clear LED Display: The led digital display on this pocket keyring alcohol tester allows for easy reading of alcohol levels, ensuring quick and accurate results. 50 Sets Data Storage: With the capacity to store 50 sets of data, this allows you to track and monitor your alcohol consumption over time. Contactless Blowing: This alcohol tester features contactless blowing technology, making it hygienic and convenient to use, especially in party settings. Specifications: Sensor type: Semiconductor sensor Display: LCD liquid crystal display Case Material: ABS plastic Test range: 0.000-0.199%BAC Measurement mode: Quick check, automatic detection Measurement time: 20 seconds Power supply: Built-in rechargeable polymer lithium battery Battery: 3.7V 120MAH Power supply: Type-C charging interface Working temperature: 0-45℃ Warm-up time: 10 seconds Blowing time: 10 seconds (usually 3-4 seconds) Reaction time: <5 seconds Package: 100*78*22mm Include: 1 * Mini Keychain 1 * Charging Cable 1 * Manual