YELIN Bike Taillight Smart Rechargeable Bicycle Rear Light IPx6 Waterproof Cycling Safety Light Auto ON/Off Durable Metal Light for Seatpost

Quality number one of a light, you can be seen from afar. This one definitively delivers. Very bright, multiple blinking patterns. Metal housing and rubber o-rings should keep it operational and prevent any humidity in for a while, even if you drop it. The bases are covered.Where this light really stands up is for the smart part. Not only on the auto mode it will automatically turn off when it's not detecting any movement and there is light, but it will also automatically turn back on when you are using the bike again in the evening. No more coming back to your bike with an empty battery because you forgot to turn it off. Genius!The light will also act as a stop light, getting even brighter for a few seconds after braking. While this is a nice touch, the accelerometer is maybe a little too sensitive, leading to some false detection of braking, but not a real issue as you will just be more visible on a bumpy road.

I am using this light on my road bike, as it was intended to be used. Its not a $10 light that you can excuse for being bright but not super bright. This light is closer to $25 and at that price range it is competing with the "bog brand names." it is my opinion that its simply not bright enough at the price point. The design is nice and the light even mounts to my aero seatpost without any problem. I light the "smart light" features and like even more that I can change it to manual mode and not have to use these features.All in all it is lick looking and has a lot of flashing options, just wish it as brighter, the light is your safety feature on the back of your bike, it really needs to stand out

I have two versions of this Xlite 100 on two different bikes. This seat post mount allows mounting on any bike with a post. It also allows quick attach/removal so buy one and use on multiple bikes. The other version has a saddle rail mount and not easily removable.The light itself has good build quality {metal body) and is sealed to keep water out. The light easily unscrews from the mount for recharging via USB. There are two modes auto or manual. In auto mode the light turns off when there is no motion detected by the internal accelerometer. In manual mode you push and hold the center button to turn on/off the device. During operation you have flash, constant or glow modes to choose from but all 3 modes work with the motion sensing brake light. Battery life is decent for the flash mode while constant and glow only gives about 3-4 hours use.Overall it's a simple but clever design, looks good too..not tacky.

I bought this because of the frame mount, since these style lights will not fit under your saddle if you have a under the seat mounted bag. I installed it and compared to my clip on tail light that hangs on the rear of my bag, this one is no where near as bright. I returned it.

complete garbage, doesnt charge. When it did work it didn't work as intended or advertised. it randomly turns on and off while riding.

Wow, why I did not know this light ever existed until I seen on my buddy’s bike. If you set on auto it will automatically go on and off by motion and when you hit the brakes it will light up brighter using g-force. USB rechargeable battery. It’s cost little more but worth every penny.

I like riding bike, this is a really a awesome raillight, lightweight, easy installed and easy use, stable, visible, no need to worry about battery since it could be charge. The light is bright and has many patterns, very useful and smart design.

My son love to bike and most of the time is after dinner. He need a bike light for safety reason. The bike light is awesome. the feature on USB charge is the most valuable feature he like, never worry about the battery again and it shows when fully charged. Highly recommended.