Portable and compact design: The Keychain Alcohol Tester is designed for convenience, allowing you to carry it anywhere with ease. Its compact size (approx. 7 x 5 x 2 cm) fits on your keychain, so you have it handy whenever needed. LED light indicators: Equipped with three distinct LED lights, this breathalyzer provides clear visual indication of your blood alcohol content. You can easily understand your results with colorcoded alerts Green for safe, Yellow for caution, and Red for danger. Easy to use: Simply press and hold the power button to warm up, then blow into the inhaler for just 5 seconds to get quick and reliable results. This userfriendly design makes it accessible for everyone. Battery operated: Powered by two AAA batteries (not included), this device allows for over 80 tests per battery installation, making it a practical choice for regular use. Use scenarios: On the go safety check before driving after a night out Quick assessment at social gatherings or parties Home or small team use to check readiness before operating machinery or equipment