These lights both work great. The front light is bright, but not as bright as some more expensive models. The rear light works well. They both have 3 "modes" that can be cycled by pressing the button; On, off, and blinking. I like to use the front light on solid so I can see well, and the rear light blinking to alert motorists.The rear light has a mount to fit on the seat post, but I have a seat bag that it can clip to nicely. The front light is the larger problem; the mount strap is nearly too small, so it take quite a bit of effort to get it on to my Specialized handlebar. The light does clip on and off the mount, so I can take it off for daytime use while leaving the mount on, but I would prefer to take the whole thing off for day riding.