Feature: The digital alcohol tester has a blue alarm. LCD backlit display, easy to read. Quick response and recovery. Detection range: 0.00%-0.19% BAC (0.0-1.9g/l). Automatic shut-off. Small keychain design, lightweight and portable. Powered by 2 AAA batteries (not included). Product specifications: Color: Black Sensor: Advanced semiconductor oxide alcohol sensor Detection range: 0.00%-0.19% BAC (0.0-1.9g/l) Accuracy: +/- 0.01% BAC (0.1g/l) Warm-up time: within 10 seconds Response time: within 5 seconds Operating temperature: 10°C to 40°C Humidity range: 40% to 90% Power supply: 2 AAA batteries (not included) Item size: approximately 11.8 x 7 x 2.8 cm / 4.6 x 2.7 x 1.1 in Item weight: approximately 52 grams Package Included: 1 x Breath Alcohol Tester 4 x Mouthpieces 1 x English Manual