Review on Padonow Smart Bike Tail Light: Ultra Bright Rear Bicycle Flashlight with 🚴 Auto On/Off, High Lumen Daytime Strobe, and USB Rechargeable Safety Red LED Taillight by Michael Jennings

If you have a saddlebag to carry hoses etc then forget about this light. The mounting system is just a piece of plastic that attaches to the seat rails and tie rods. If you have a bag that can also be attached to the rails, such as a an Ortlieb or similar, you probably won't be able to attach them at first as it will likely interfere with saddle adjustment. The mount is very flimsy and just doesn't hold the light in place. It bounces up and down over bumps and I haven't ridden yet where I don't come back and find the light is off even when fully charged. There's a bar mount for it, but that wins for putting it under the saddle. I already have a Varia unit attached to the seatpost, I wanted some extra light under the saddle. The block doesn't appear to be very bright either.