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It works! Wakes me up when I nod off. I never drive sleepy, so I haven't tried it for that purpose.
It's quite loud. Read more
Kind of abulky thing, but I suppose you pay a LOT more for miniaturization. The Zapper has caught my wife nodding off as she works at home, but hasn't yet been used for driving, so... Read morePublished 10 months ago by Norseforce
Nice to have in the car for added protection. You never want to fall asleep while driving!
Great protect to have.
All of us at one time or other should have access to one of these devices. I put one in each family car. I wished I had had one in my college/service years. Read morePublished on June 20, 2012 by Amazon Customer