There are instructions and a full description at the sale site and complete directions inside the keychain itself.I didn't realize and am disappointed that each device can be used only one time. If you order (one) you actually get (three) breathalyzers...but all are disposable.1. Get the key from your friend or family member 2. Alcohol impairs judgment never test yourself 3. Test him with the LegalLimit Breathscan.If color changes to blue/green cast, this person should not drive 4. Keep the key and find a designated driver or call a taxi. 5. Save a friend or family member s life!
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