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 John Lewis

Great little light that is bright and easy to mount. All features have great battery life and I love the braking and auto off features. Since I am not buying this for a bicycle, but for the wheelchair used by a 90 year old relative, the one touch turn on is very literally a life saver.Charge seems to hold well. My only complaint is a little unfair: since this attaches to a wheelchair the interface is easy enough for a 90 year old with somewhat diminished capacity, but having to remove the light from it's retaining strap to charge the unit will be impossible. Fortunately the battery will last a while.(Dear entrepreneurs - PLEASE design a lighting system designed to fit wheelchairs, walkers , scooters, etc. that can be easily operated, mounted, and understood. It shouldn't cost 3x as much as a bicycle light! Amazing there are almost no examples in a world where everything else is available at fingertips. And spare me the lectures.Let's see YOU try to keep a strong willed veteran out of his chair and off the sidewalks at night. Good luck! )Why in the world does revain want me to rate the 'thickness'? Stupid bots.