I bought 12 of these as funny Christmas gifts for friends. I put batteries in these little boxes so my friends could use them right away and I witnessed 12 of these erratically light up... some people where totally sober being told they were drunk and other people who had been drinking and had lost proper use of the English language got a reading of sober. I would not bother with this even if they are being handed out for free. It's too frustrating to try to get it to work.Get more detail about Alcohol Breathalyzer Tester Keychain.
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