Automatic shutdown, fast response. Alcohol tester has a key chain for easy carrying Rapid collection of breath samples and provision of blood alcohol content (BAC) estimates using advanced semiconductor alcohol sensing technology The LCD monitor will show you how drunk, whether it is dangerous (more than 0.05% bac), is not safe (approx.) 0.02% bac) or safe (below 0.02% bac). "Warning" is displayed when the result is between 0.02% and 0.05%, and "Danger" is displayed when the result is equal to or higher than 0.05%. specification: Colour: Black Size: 110 * 70 * 25 mm Battery: 2" AAA" alkaline battery (not included) Range: 0.00-0.19% BAC & 0.0-1.9g/l (or 0.00-0.95mg/l BRAC) Accuracy: 0.01% BAC (0.1 g / l) The product contains: 1x digital alcohol breath tester 4× nozzle