ONVIAN Colorful Bike Tail Light with Turn Signals, USB Rechargeable Bike Brake Light with Wireless Remote, 15 Light Modes 7 Colors Waterproof Cycling Safety Light for Adults Kids Road Mountain

I saw this light on my friend's bike on a Monday night MTB ride, and by Thursday night ride I had one on my bike too :)After reading several reviews saying it "didn't fit their saddle", I think it's because people don't look carefully enough in the bag with the usb cable, and notice there are two little red plastic protector shims that go in the pin holes in the hooks that go around the seat rails. ;) 99% of MTB and road bike seats will have the normal width rails and this should fit. If it doesn't fit your seat rails because you have some unusual non-standard seat mounting system, there is an included silicone strap mount for frame or seat post locations also. I have never seen an automatic brake light function on a rear bike light before, its pretty cool and it works great. This is one of those rare ~$20 items that really impresses, I have paid 2x or 3x for name brand tail lights that aren't designed and built as well as this one. Only criticism I have is that the screws were a bit too tight in the holes. I had to first remove the 2 hooks by unscrewing them counter-clockwise, and then screw the screws all the way in clockwise, plus several more turns to free them up. That way the hooks could slide outwards on the screws during installation.

Really cool bike light. LED modes are cool and super bright. The brake accelerometer is a game changer! Very cool and safe! Drive Fast Take Chances!

Bright, has auto brake light and turn signals, can change colors, easy to mount, fits good, looks good, I would recommend it!

This light is definitely a solid purchase, although I feel it's important to mention that it's best used as a secondary light. As some of the other reviews have mentioned, it's not bright enough at baseline. It does however get significantly brighter when it senses braking, but I cannot say how accurately it does that since I'm not able to observe the light while I'm riding. The other downside is that it doesn't have full 180° visibility, especially when used with the under-saddle mount.The light itself has a metal shell with a plastic lens. There is a metal activation button in the center with 4 small blue LEDs that indicate the battery level (I'm not too fond of the battery indicator as it does not stay on very long, so you have to pay close attention when check the battery, tapping the side of the light housing seems to briefly activate the indicating lights as well, or mine might just be somewhat defective, who knows? In any case, I was eventually able to time the camera just right to catch a photo of it). There is a rubber sealing ring by the thread to maintain water resistance (it is only water resistant while mounted, since the mount acts as a cover for the micro-USB charging port), and even after a few rain rides there has been no decrease in performance or sign of water damage. The under-saddle mount is pretty solid. It's a CNC'd metal bracket that clamps onto the rails of the saddle. Mine came poorly machined but still usable, in fact I had to cut small pieces of nitrile exam gloves to give the screws and clamp pieces extra grip after the clamp started coming loose, haven't had a problem since though. My other complaint was that the clamp had threads through both the clamp pieces and the main mount, meaning I had to make sure there were no gaps between the interlocking pieces when tightening the screws. On a positive note, the clamp came with orange bumpers that made it compatible with both oval and round saddle rails.The seatpost mount is made of a threaded metal light mount with a rubberized 'stretch-to-fit' fastener and metal hook, which is secure enough. I had a Blitzu Cyborg rear light with the same style mount and the mount held up very well after a few years of abuse, I'd still be using it had I not lost the light. So this mounting option is solid as well.Overall, it's a solid product, but bear in mind that you get what you pay for. It's cheaper than most mid-range bike lights and the quality certainly reflects that. However, I still give the light 4 stars because when all's said and done it still works pretty well, the battery life is excellent (have to charge maybe once a week if I'm only commuting), the light itself is pretty solid, and it just plain looks cool, all for a little over $20. If you're concerned about visibility I'd recommend pairing it with any other tail light with a wider viewing angle, rear wheel lights, or a rear tire with a reflective side wall. Oh and also, don't bother with the auto on-off feature, hasn't worked for me yet.

I needed a seat mount light to be visible over a rear fender. The mount is well made and easy to install. I have it on a fat tire bike that I ride hard and it is staying put. 4 lighting modes and USB rechargeable. It's bright enough to be effective, not as bright as some others that I own. The brake function and auto on and off are nice features that would be great for a commuter. Overall, I was surprised at the value of this light.

It worked as expected, but the light snapped from the plastic piece that is attached to the saddle during a ride and got lost. The light is good, but the attaching system needs to be improved.

I was needing something for riding at night. I'd already been using a forward light but not a reverse. I liked the idea of the accelerometer and it works well! I use the breathe mode on less busy roads and the strobe blink on those with more traffic. Great battery life so far will update.Updated 6/30/2021: Company is very responsive. The light works like a charm still and the responsive brake light is much more useful than a turn signal in my opinion. if you're stuck between 2 products one that offers a turn signal light and another (this one) that offers accelerometer brake lighting.

Given the price point this seems extremely well made, mostly metal housing, not cheap plastic. I read some reviews of seat rail mount issues, mine fit nicely. I have an SDG saddle and the rails have a nice paralell section that it fit fine on. Does not seem like it will come off ever, even with hard trail riding. One of the few solutions for a dropper post. Bright at night, not crazy bright during the day, but I'm using it on a Mountain bike that just sees some streets at night occasionally. For a road bike I might want something brighter to catch the eye of bad drivers during the day, but for Mountain Bike with a dropper post this is perfect. Hard to believe it can be this nice for the price. Again, it isn't dim, just some I have seen on road bikes are super bright even in daylight. No regrets on the purchase. Sturdy and durable were more important than brightness to me. Still giving it 5 stars.