- Portable and compact design: The Keychain Alcohol Tester is designed for convenience, with a compact size approx 7 x 5 x 2 cm that fits on a keychain, so you have it handy wherever you go. - LED indicators for clear results: Three distinct LED lights provide a visual readout of your blood alcohol content. Color-coded alerts—Green for safe, Yellow for caution, and Red for danger—make it easy to understand your level at a glance. - Easy to use: Press and hold the power button to warm up, then blow into the inhaler for 5 seconds to obtain quick and reliable results. The user-friendly design is suitable for everyone. - Battery operated and efficient: Powered by two AAA batteries (not included), this device allows for over 80 tests per battery installation, making it practical for regular use. - Use scenarios: After social events or parties to check BAC before driving; before driving, operating machinery, or commuting; during travel or at events for discreet personal monitoring.