SerfasThunderbolt 2.0 120/50 Light Combo One Size

Easy to mount about anywhere on the bike. Super bright and easy to toggle through the different flashing modes. Charging is as easy as a quick detach clip and plug into a micro charger. Hands down the best bicycle lights I have seen!

Very small and narrow but the mount is quite wide. It's quite bright and the battery lasts a lot longer than the original Thunderbolt, but not the mounting system is no where as neat and tidy as the original. Basically this version only beats the original with battery life and actual size but the mounting system wrecks it's sleekness.

I feel like these make my rides a little safer. The front light is not bright enough to serve as a headlight, but will make you more visible to drivers. They seem to go for the rated number of hours (though I charge them before they go flat). The clips & bands work pretty well.

The prior version was my go-to bike lighting system. I like this version even more. The separate mounting straps allow for them to remain on the bike, while the working part of the device (shown in this picture) is unmounted for charging. No more fussing with the straps to perform periodic charging. Set the mounts and forget them. The charging feedback mechanism (flashing blue light) is clear. It seems this version charges faster than the prior version and the actual run time is much much longer, particularly in the daytime flashing mode. My guess is 10 hours of running time. I am impressed with the thoughtfulness of this new design. Serfas raised the bar.

Great rechargeable bike lights. Excellent battery life, several settings for lights, constant on, multiple flash options night time and day time brightness options. Only thing missing is on the mounting adjustability. You can only angle the light on the base one way, not two ways, I.e. X-Y axis.

I used these light maybe 6 times. I mounted them on my safety flag 1/4 in pole to help with visibility while riding my recumbent trike. The white light stopped flashing. It only puts out a dim light now and eventually stops working all together. The red one still operates but I don't have much hope of it continuing to work. I also don't like the mounting system. I would not recommend this product.

Just got them but so far so good!! Both lights are sleek on design and bright for the size. Super easy to install with no permanent installation needed which is nice! A little pricy but I think the quality is there to back it up. I’d buy it again.

Plenty bright for being seen. Multiple settings. Quick charge and good battery life.