SincereetaliFeatures: Easy to use: blow upwards on the breathalyzer, then wait for the test result to be displayed, really a simple method to test your body alcohol concentration. Non-contact testing is safer, no mouthpiece required, more economical. Detection range: 0.000%~0.199% BAC, 0.000~1.990 BAC, 0.000~0.995mg/L, one button for unit switching. Orange backlit digital display: convenient to read the test result in low light conditions. Adopts semiconductor sensor: features high sensitivity, high precision and high reliability, warm-up time is less than 10 seconds, fast response and recovery. Auto power off, energy saving: powered by 2 x 1.5V AAA batteries (not included), with low voltage indicator when the battery voltage is too low. Compact Portable Size: Measured size in 4.6 x 1.8 x 0.6 inches, and comes with a lanyard to hang the tester as you like, it is very convenient to take it with you. Specifications: Material: ABS Test Range: 0.000% ~0.199% BAC, 0.000~1.990 BAC, 0.000~0.995mg/L Accuracy: 0.1 Reaction Time: 5s Warm-up Time: 10s Working Environment: 5~40 Power Supply: 2 * 1.5V AAA Battery (NOT Included) Item Size: 116 * 45 * 15mm / 4.57 * 1.77 * 0.59in Item Weight: 45g / 1.59oz Package Weight: 120g / 4.23oz Package Size: 15 * 9.8 * 3.5cm / 5.91 * 3.86 * 1.38in 1.37 inch