Here’s the lights I bought for my my bicycle. Bell Radian Light set. I got them at Walmart.
-Long run time
-50-hour steady use
-115-hour flash use
-Tough, weatherproof cases
-Includes headlight, taillight, Allen key and mounting hardware
-Requires 3 AA and 3 AA batteries (not included)
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Detailed instructions and help via YouTube: http://support.google.com/youtube/bin/static.py?hl=en&page=guide.cs&guide=1680728&topic=1683835