Note: The product does not Include batteries Features: 1. Digital display of alcohol concentration results with prompt tone 2. Quick response and recovery 3. Alarm points can be selected 4. Red backlight 5. Automatic shutdown and power-saving function 6. The mouthpiece can be replaced 7. The digital alcohol breath tester has a key chain, which is very convenient to carry. Specifications:： Battery: 2''AAA'' alkaline batteries (NOT INCLUDE) Material: Nanometer Sensor: advanced semiconductor oxide alcohol sensor Range: 0.00-0.19%BAC & 0.0-1.9g/l (or 0.00-0.95mg/l BRAC) Accuracy: 0.01% BAC(0.1g/l) A breathalyzer or breathalyzer (a portmanteau of breath and analyzer/analyzer) is a device for estimating blood alcohol content (BAC) from a breath sample. The breathalyzer is one of the most affordable breathalyzers available. It can be used in a wide variety of settings including clinical test applications and for personal use. Its uses advanced semiconductor alcohol sensing technology to quickly take a breath sample and provide a blood alcohol content (BAC) estimate. The lcd graphic display will indicate how inebriated you are, whether it be dangerous (over 0.05% bac), unsafe (approx. 0.02% bac) or safe (under 0.02% bac). Displays ''caution'' when result is within 0.02% - 0.05%, displays ''danger'' when result equals to or higher than 0.05%. Package Includes: 1*Digital Breath Tester