Review on Bike Tail Light USB Rechargeable - Super Bright LED Rear Bicycle Light Clip On for Enhanced Cycling Safety - 6 Lighting Modes by Michael Bressler

Bright beautiful flashing modes. Easy to install on my bike's seat post, but once I installed the rack there was no room to mount it. It's not the light's fault, it's the shelves. I bought another light from a local bike shop who figured out how to bolt it onto the rack. I have now fitted this light to the back of my helmet (Kingbike Black and Yellow). It's not difficult to attach or remove the helmet from the helmet, but the rubber pad doesn't seal as well on the helmet as it does on the seatpost. The USB charging function is great. I get two or three trips (1.5-3 hours each) off the electricity bill. Highly recommended if you have a solid mounting point for the light. Not the best option for mounting on a helmet, but suitable depending on the helmet.