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 Mark Fleming

So much to like about this. Made of aluminum not cheap plastic, the battery life is phenomenal, the seat mounting location is easy and super secure, and the light is very bright and visible. The 4 battery level LEDs are great for helping you know when it needs another charge, but honestly the battery life is so good on this those should be very few and far between. It’s a great light that I wish I would have had long ago.