Great product, super light weight, highly functional highly effective. Good design considerations. The elastic rubber strap has hole positions to accommodate most any bicycle mounting part and the rubber will provide friction to prevent it from turning off its axis. Two buttons to control 6 modes can be a little annoying but you can quickly get to the mode you want. Slow blinking, fast blinking, steady, occulting, dimmer, dimmest. Bright and a quick charge from a USB C cable.