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 Kevin Wilkins

I bought this to comply with local ordinances that say I need a reflector or light on the rear of my bike. The seat rails are a great spot for a rear light. It's as high as I can get it without a sissy bar, and I can use my dropper post without crushing it.I read the reviews, and I don't plan on even trying the automatic or strobe features. Four clicks of the center button, it's on. One more click, it's off.$20 is a lot for an on/off light with other features that don't work, but I didn't see any other way to get my hands on one of these brackets. I installed it with blue Loctite. I wish they sold the brackets separately. I'd have one on each of my bikes. The bracket and location are awesome.Update: I previously said $20 is a lot for this light. I don't think that any more. I think this light is at least tied for best-designed tail light out there.Update: The battery lasts a long time between charges and has been through many charges. Still works. Buying my third one today.