Feature: The digital alcohol tester has an audible 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. Compact 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–40°C Humidity range: 40%–90% RH Power supply: 2 AAA batteries (not included) Item size: approximately 11.8 × 7 × 2.8 cm (4.6 × 2.7 × 1.1 in) Item weight: approximately 52 grams Package Included: 1 × Breath Alcohol Tester 4 × Mouthpieces 1 × English Manual