Keychain Portable Breathalyzer with Multiple LED Lights for Blood Alcohol Level
Only Green LED light on: Safe, the alcohol concentration level is under 0.02% BAC (0.1mg/l BRAC). Only Yellow LED light: Caution, the alcohol concentration level is 0.02% to 0.05%BAC (0.1mg/l BRAC to 0.25mg/l BRAC).