Specifications Name: Digital Display Alcohol Breath Tester Range: 0.000-0.199% BAC / 0.000-1.990BAC / 0.000-0.995mg/L Alert: 0.050%BAC / 0.500BAC / 0.250mg/L(BrAC) Operating Time: warm up<20s, response: <5s Working Voltage: 3* "AAA" alkaline batteries(not include) Working Current: 120mA Working Temperature: 5~40 Display: Blue color back light LCD display Size: 11.2*6.1*2.9cm Weight: about 68.4g Features Digital alcohol test with audible alert. Digital backlight LCD display to show clear results both in days and nights. Quick response and resume. Auto power off. Low battery alarm. Compact and lightweight, convenient to carry and self-test. When using precautions, must see 1 after drinking , it is recommended to wait 20 minutes before testing, because alcohol takes about 20 minutes into the blood from the digestive organs , and residual alcohol in the mouth takes time to dissipate . 2 To get a more accurate result , the distance should be at least three minutes between each test . 3 Do not use benzene , gasoline and thinners cleaning product ingredients tester . 4 Do not allow any liquid penetrated into the sensor. 5 to remind you , to you and the safety of others , do not drink and drive. Package Include Alcohol Tester*1pcs Mouthpiece*6 Instructions*1