OK bought this in a hurry. 1/3 more than my current replacement that is brighter and just plain works.... OK back to the Visto... If it's turning off after 10-20 sec your still in demo mode, re-read the directions. Now if it's going off after 10, 20, 92 minutes you have another issue going on. My light would randomly turn off, Per reviews here at Walmart.com and other online sources I thought it had some bump issue... then one day I accidentally broke the mount. Well it was right time as the night before I was flustered and ordered new rear lights for the wife and I. How I fixed my Visto and I use it daily now without fear of it going off. I trimmed the mount point to allow the light to fit inside my helmet vent on the read. I drilled a small hole lager enough to pass wire ties through. I wire tied it to the back of my helmet. Bump issue resolved, well sort of. Next you need to pry open the red lens cover. On the bottom side is a photo sensor, I covered mine with electrical tape. This will trick the sensor into thinking it is always night, so no matter if your in hard on mode or auto mode the sensor will not disable the light. Since I made this change the light now stays on for my full 28 mile ride through the hills over rocky terrain.
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