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

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 little bike light is pretty cool! So many features on this. The light can be adjusted just to your needs. The coolest part about it is it senses when your sopping and lights up a bright brake light! You can adjust the brightness, different modes to your liking and has a fantastic battery life even for the longer rides! Mount is great, you can mount it just about anywhere on your bike! Fantastic product, very well made! Honestly this thing should cost way more for its quality.

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.

I love this for the additional visibility it offers on late evening/night rides, especially since I usually ride with at least one of my kids on my bike with me. Typically, I keep this on flashing mode to help increase visibility and prolong battery life. I’d say this last me easily a few weeks of riding with my kids before having to recharge. It is even easy to move between my two bikes I typically ride since it included a more permanent mount to the saddle rails as well as a quick release that I have on my secondary bike. The light itself unscrews from a housing that is on each of the mounting options. I plan to buy another one for my kids’ bikes since it is an inexpensive but functional light.

Not super bright, but a solid option. The auto-on detection works well. Battery lasts a good while. Quality construction. Good if you just want to leave a taillight on your bike with minimal hassle.