Review on Stay Safe While Cycling With G Keni Smart Bike Tail Light - Auto On/Off, Waterproof, USB Rechargeable, And Ultra Bright LED Warning Back Bicycle Flashlight! by Rafael Lee

I was looking for a seat mounted tail light to use with my mountain bike. Most tail lights just strap to the seat post and don't work well with dropper posts. Install was a little fiddly but since install it has been solid and stays put. I've got about 130 miles of mtb trails and about 100 miles of road/gravel with it installed and it hasn't moved or shifted. I mostly use the blinking feature on the road and I haven't had to charge it after the initial charge.Definitely recommend if you have a dropper seat post and are looking for a tail light.