Nice little turn signal for the top of the cone to attract attention in dark places or around corners where the headlights might not hit the reflective strips . 2 flash modes and steady light. Inexpensive product but it does the job. For all reviews that speak of defects, as well as future buyers, note that the polarity marking on the batteries (if visible at all) matches. To work properly, install the batteries in series (one right side up and one right side down), ie you get a positive battery post and a negative battery post. Then place the battery box on the device and try to push the button, if that doesn't work, remove the battery box and rotate it 180 degrees, thus reversing the polarity on the device (this is a DC device, the Polarity is important, unlike AC units). Then the problem should be solved and everything will work fine. I agree that better labeling or instructions would be helpful, but this is a fairly simple circuit and only 2 variables, easily fixed in less than 30 seconds. As for the button on the bottom, I suspect this is to keep water out. A one-piece molded "dome" makes water ingress impossible. Detecting a side intrusion will negate this. Not bad overall, about $3 each once you figure it out.
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