1,legerity,practical,safe,easy to take with,

2,use as examine tool for police check car,driver check by self,friends gather together drink how much is safe to drive,it can tell you,
3,3 step alcohol test, 
-- A.green light on:Safety: under 0.02% BAC(0.1 mg/ l BRAC)
-- B.yellow light on:Caution: 0.02% BAC(0.1 mg/ l BRAC)to 0.05% BAC(0.25 mg/ l BRAC)
-- C.red and yellow light on:Danger:over 0.05% BAC(0.25 mg/ l BRAC)
4,single  key design, operat easy,
5,short prepare time,
6,quickly react and resume,
7,torch function(night light),
8,key chain
9,Use two "AAA"(UM-4) alkaline batteries,
( this machine do not supply batteries)