Not clear from the description, but the light at the end of the flagstick flashes when the flag moves. Because it's mounted on a spring, the flag will flash when you pass a bump. I also found that in low light I could reach back and shake the flag a little to warn a car approaching from behind. I don't recommend making this your only source of light! Most states require a permanent or flashing tail light (and a white light up front) at night. I think it's a great idea to have a flag on a pole pointing in the direction of travel and would love to see this become the standard for commuting cyclists.
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