Features: Easy to use: blow to the top of the breathalyzer, then wait for the test result displayed, really a simple method to test the alcohol concentration of your body. Non-contact testing is safer, no mouthpiece required, more cost-effective. Detection range: 0.000% ~ 0.199% BAC, 0.000 ~ 1.990 BAC, 0.000 ~ 0.995 mg/L, one button for unit switching. Orange backlit digital display: convenient to read the test result under conditions of low light. Adopts semiconductor sensor: features high sensitivity, high precision and high reliability, warm-up time is less than 10 seconds, fast response and recovery. Automatic power off, saving Power Supply: Powered by 2 x 1.5V AAA batteries (not included), with low voltage indicator when battery voltage is too low. Compact Portable Size: Size measured 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. Features: Material: ABS Test range: 0.000?% ~0.199?% BAC, 0.000 ~ 1.990 BAC, 0.000 ~ 0.995?mg/L Accuracy?: 0.1 Reaction time: 5s Preheating time: 10s Working environment: 5~40 Power supply: 2*1.5V AAA battery (NOT included) Item size: 116 * 45 * 15mm / 4.57 * 1.77 * 0.59inch Item Weight: 45g / 1.59oz Package weight: 120?g / 4.23?oz Package size: 15 * 9.8 * 3.5 cm / 5.91 * 3.86 * 1.37 inch