Feature:Pormptly and conveniently design for measuring BAC.A simple method to analysis Blood Alcohol Concentration at anytime and anywhere.It's easy to carry.Digital alcohol tester with audible alert.Range 0.00-0.19% BAC & 0.0-1.9 g/l.Quick response and resume.USe mouthpiece.Auto power off:1 minute approxKey chain.Use 2 x 1.5V AAA alkaline batteries (Not included).Operating time:warm up:10s response:<5sEnvironment temperature:5-40 degrees Color: GRAYItem size: 110*70*25mmNet weight: 55gPackage weight: 64g When using precautions， must see !1 after drinking ， it is recommended to wait 20 minutes before testing， because alcoholtakes about 20 minutes into the blood from the digestive organs ， and residual alcohol inthe mouth takes time to dissipate .2 To get a more accurate result ， the distance should be at least three minutes betweeneach 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.For aviation security reasons， this product delivery without battery