ROCKBROS Smart Bike Tail Light Brake Sensing Bicycle Rear Lights USB Rechargeable IPX6 Waterproof Bright LED Bike Light 260mah Cycling Safety Road BikeTaillight Accessories 4 Modes

After almost a year of use on my commuter this thing is doing amazing. Super bright, settings are easy and the motion activation is so handy, I never have to think about turning my light on now. It rarely needs to charge and hasn’t actually died on me yet. The only con is the angled insert. It doesn’t have any way to secure to the light once it’s removed from the bike to charge. Definitely a solid purchase

First the best parts - Small form factor & its USB-C rechargeable. - Auto shut off & also auto turn-on modes lights up when the bike starts moving again! - Break Light! - the accelerometer based brightness control is good if the bike stops or moves backwards it glows! - two types of mounts ( saddle mounts) with ample cable ties useful esp., for bikes with aero seatposts and saddle post mount for circular saddle posts only (32mm max ) Cons The saddle post rubber gets loosely attached to the holder although it gets sandwiched between the post and the holder after install it can easily get lost if you were to de-install it say, during the bike washes. I think , no harm using CA glue( superglue) to fix it to the holder permanently. The cable is too short and useless use your stand usb-c phone cable

Excellent little lights that are very bright night or day. I love the auto-on feature the most. Brake light works good too. I really can’t tell when the battery is low so when it dies it dies. Charges quickly, a couple hours guess. Got them for less than 13 bucks a year ago so we’re pleased.

This is smaller than I expected it to be, but it’s bright and it really works. It acts like a brake light. Shuts off automatically, which saves recharging all the time. It’s very clever.

Cool light ..worked great till I had a wreck and fell off

Surprisingly good for the price: very bright, battery life on a kids bike is enough to keep it unplugged for weeks being used for school commute, 15-20 minutes a day, even during freezing weather and unheated garage storage. Acceleration sensor may be a bit too sensitive, but I'd better prefer to have a brake false positives than a missed braking. Note that auto-off doesn't work in all the modes, check guides carefully.

I've had this little light for about 5 months now and it's been great. It has several different modes to select from and it has a really neat feature where it will light up solid when braking, just like when braking in a car, so it helps people to know you're putting you're actually putting your brakes on and slowing down/stopping. Charge seems to last a while and I like that it's USB-C. I ended up putting a dab of silicone caulk on the back of the little rubber shim to keep it in place and not get lost as I could see that happening. I do recommend!

Truly bright at night, love the smart feature when slowing down. Easily mounts anywhere, lasts a long time on single charge.