ROCKBROS Bike Tail Light Smart,Brake Bicycle Rear Lights Rechargeable,IPX6 | Ultra Bright,LED Back Lights,Type C USB,Waterproof,Cycling,Safety Taillight, Bike Accessories

This things awesome! I love tricking out my bike with little gadgets and practical things as well. I’ve gone thru a lot of break lights over the years and this is the only one I’ve wanted to rate! Works so well, has lots of intelligent features like auto off in daylight, and getting brighter when breaking! Installation was super easy can be accomplished two different ways which is handy. Highly recommend! My only slight gripe is that you have to unscrew it from the mount to charge. A quick release would be nice, although the last one I had fell off when riding and it had a quick release! I guess we can’t have it all can we? 😅

I purchased this taillight to augment the anemic flasher on my Garmin Varia Radar. The RockBros light is a great value and an excellent rear light. A full charge seems to last forever and the brake light function is appreciated by riding partners. The light is very bright and easily visible even on a sunny day. The light came with two mounts, a strap for the seat post or a clamp on mount for the seat rails. The light screws into either of them just like a bottle cap. The charging port is accessed when you unscrew the light from the mount. The strap mount works fine, but as a rule I just don't trust straps. I used the clamp mount, which installed easily and holds the light in place on the rails. The clamp was a slight bit loose on my rails, but a small bit of tape under the clamp fixed the issue. I've used the light for about 1500 miles on gravel and trails with no issues. Taillights are a simple bit of kit, but I really appreciate the added visibility, both day and night. Hard to beat the value and function with this light.

This is the best taillight I’ve come across. It’s made of metal-not plastic. It screws securely to the rods under the bike seat or it will “bungee” to the seat tube. The light itself unscrews to recharge and seems to hold a charge for a good amount of time. It offers a variety of blink settings. I particularly like the charge level indicator- four tiny blue lights around the center of the lens that go out one at a time as the level decreases. It is very bright and easily seen in daylight. I would buy this light again.

Like other comments It does know when you are Breaking how idk im still trying to figure it that out. But when people are behind me and I slow down without breaking they tell me its Showing breaking so my guess is it has to do with the WIND hitting it and know it has less wind so its detecting your breaking. Would Totally buy again when mine goes out or stops working but Might get the mini next time not sure. I do HIGHLY recommend this for E-bikes that do NOT have a break light it works Great.

Good build quality and mounting hardware feels secure. I like the two mounts included; one light for two bikes; just unscrews from one mount to screw onto the other. USB-C charging is always nice. The 4 modes have good options for always flashing or motion detection. Brightness is pretty good for night-time, but won't overcome sunset-type conditions and the light is not very noticeable in daylight. I'd recommend finding a brighter rear light for day time. The 4 dots for battery level are helpful but don't work great. I haven't seen 1 dot "25% battery life" because it dies after it gets to 2 dots. That said, if it's charged up the battery life is still decent and overall still a good light.

Update: I would remove stars (not possible) because the “saddle bracket” after coming loose eventually fell off. They include a second alternative method “seat post strap” which is way more reliable. The primary attachment method is flawed do not use it or you will lose it!, or you will have to replace it. I will NOT re-purchase this item if it fails again! I have purchased numerous cheap tail lights in the past which usually end up falling off or dying after a few months. I haven’t had this one for that long but I dig it! I didn’t know how well it worked until I switched bikes with my girlfriend and rode behind her. The light is bright and quite noticeable and when you slow down it brightens and then goes out like a brake light. There are two mounting options which Enables me to quickly switch it To my other bike. The battery is strong, and charges up relatively quick. Don’t need to worry about the battery dying on long rides.

UPDATE: Rockbros refunded my purchase price, and I will re-buy when they make a unit that has auto on/off and motion sensing in the daylight. Outside of that, it is a very nice unit. Small and bright, with a good mounting system. The brake light algorithm seems to work well. UPDATE: The Q5 is a Tail light. The one I have, does not have auto on/off, motion sensing in the daylight - despite what RockBros.says. In fact, if you very carefully read the PR info, it says this. The tail light has manual mode, strobe flash and contiguous in the daylight, not auto on/off motion sensing. The RockBros Q5 tail light Has several problems. There is no way to shut off the ambient light sensor for the blink and breath functions. This makes it useless in the daylight and only useful at night. So the kid riding to and from school does not have a tail light, which is why I bought a vibration sensing/auto shutoff light in the first place. The manual says that mode 3 and 4 (strobe blink and continuous) are useful in the daylight, but they do not have vibration sensing or auto shutoff. So to get into that mode you have to push the button through all the other modes, and same to shut it off - not very "smart". So, I took the unit apart (thus voiding the warranty) to see if I could cover up the ambient light sensor. That didn't work because they use the off cycle of all the LEDs to sense ambient light. So, I had to block all the LEDs to keep it blinking in the daylight. I asked this question before I bought it, and got an inexact answer back from someone who is not a native English speaker.

This is a fantastic light, very simple to put on, able to adjust it to my bike, works well, and last for a while before it needs to be recharged.