Knog

The light itself is by far the best rear light I've ever seen. It makes me feel significantly safer. I've had multiple cyclist friends comment on how bright it is, and another friend in a car say that the "rolling flash" makes me look like something other than a cyclist and it really grabbed their attention. The light is bright enough that I don't have to look around much to see if it's on, as it's evident by how much of my bike and the ground around me it's illuminating. You can also plug it into the computer to change, delete, and customize (brightness, speed) lighting modes, as well as make your own. I found this useful for removing modes I don't use and changing the speed of the rolling flash, the mode I use most at night.

My only complaints are the male USB-A port for charging. You can use their included short extension cable, but without it, this means plugging the light itself directly into a USB-A port, which is less convenient (and charges slower) than something like having a female USB-C port. Getting the light off the mount can also be tough, but at least that means it's secure.

This is an update to my previous review, where I noted the primary weakness of this product: it's clasp. I wanted to note that Knog made good on its warranty, by sending me TWO replacement clasps, so kudos to them. My plan going forward is to always remove this headlight from the handlebar whenever I'm not actually riding the bike. This way, the pressure on the clasp will be minimized and I think I may get a reasonable span of use for this product. Perhaps in a future iteration of this light they can improve the mechanism of attachment.

Several reviews said the lights died after a week or two, just like mine. I took them off and felt like a chump. But then I wondered if that's the only way these simple yet elegant lights have to tell us they need to be charged. I plugged them in to USB-A chargers. They gave the single bright LED message. I checked them often, to make sure they weren't getting hot, ready to burst into flames or something. But after several hours, the BRIGHT LED was off. I pressed the tiny power button. The light came on in "see me" mode. It let me select a blink pattern. They've been working for weeks now. I'm one with these little things. I mounted the white one on the bottom of my left fork, and the red one at the bottom of the left seat stay. Pretty cool looking imho. These are easily worth the pittance BTD charges for them.

I bought this as an experiment . I had other bells on other bikes, but needed a bell that fit a larger bar on one of my bikes. I was curious about these anyway, so I bought one. I have it on my commuter bike, but have used it on trails as well. Frankly, it could be louder. It may be adequate if the person being alerted isn't wearing ear buds or earphones, but if they are, it isn't making an impression. In fairness, my other bells do not always make an impression either, but they do so fairly often. I do like the appearance of this bell because it blends in with the bar rather than looking like a growth on the top of the bar. It is also important to make sure that the portion of the bell that does the ringing is not in contact with brake or derailleur cables as that with muffle what ringing there is.