1.legerity,practical,safe,easy to carry.
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.step alcohol test:safety: under 0.02% BAC(0.1mg/1BRAC), Caution:0.02%-0.05%BAC(0.1-0.25mg/IBRAC);Danger:over 0.05% BRAC(0.25mg/IBRAC).
4.quick react and resume.
5.count down and up.
6.torch function(night light) .
7.2X AAA alkaline batteriers.
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