Feature: 1. Easy to Operate: Turn on the power button of the ethanol tester, wait for 10 seconds for preheating time, then blow evenly for 3‑6 seconds until a beep is heard, and the result will be displayed on the LCD screen for 5 seconds. 2. High Accuracy: This breathing device uses high accuracy semiconductor ethanol sensor to monitor the ethanol levels. Note that to obtain more accurate test results, please stop drinking ethanol for 20 minutes. When using an ethanol tester, the interval between each test should be maintained for 2‑3 minutes. 3. Clear Display: Three color detection indicator light and sound alarm. After using the ethanol tester, when the test result is below 0.08% BAC, the green LED light will light up and emit three short beeps. When the test result exceeds 0.08% BAC, the red LED lights up and emits three long beeps. 4. Built in Filter: Scientific filtration, filtering air and leaving only ethanol. The quality of ethanol is too high and flows downwards, with impurities automatically discharged for more accurate detection. 5. Convenient to Carry: Compact and convenient to carry, the host has a rope hole in the lower left corner that can be fastened with a keychain. Specification: Item Type: Breath Tester Material: ABS Battery Model: 3 x AAA battery, shipped without battery. Detection method: Semiconductor gas sensor Measurement Range of Ethanol Concentration in Exhaled Breath: 0-200mg/100mL Measurement Object: Ethanol concentration in exhaled breath. Sensor Replacement: No Work Temperature Range: -5 ℃~45 ℃ Storage Temperature Range: -20 ℃~50 ℃. Package List: 1 x Breath Tester5 x Breath Nozzle Replacement1 x User Manual