2-Mode Red LED Light Tie-On Bike Light Keychains - Red (Pair / 2 x CR2032)

Pros: Great little lights, they are easy to attach anywhere due to the stretchy rubber mounting and they are surprisingly bright for just one red LED. They have a jewelled cover which spreads the light well for better visibility and worked immediately from the packet with good batteries. I've purchased this style from different sellers on ebay and they usually come with dead batteries and various problems but these seem much better quality.

Cons: Not waterproof, not even very water resistant really. This is a problem on the rear especially where you get water flicking up from the back wheel. This is a real problem as I leave these on my bike most of the time because they are so small and light weight. I guess you could take them off easily if it was wet although then you'd have to store or carry them somehow.

Other: Buy it, they're good.

Pros: Pretty bright red LED for its size Its good enough to let other vehicles know that you're there. easy to mount and can be mounted anywhere and very secure

Cons: its not really weather proof The price can be further reduced Battery does not last long, it died only after 1.5 hr of usage before i have to replace it. sometimes the switch get stuck so its hard to choose the mode you want as it often skip a mode

Other: worth for your safety

Pros: Great light,powerfull and easy to use and open. The light its bright and you can combine static light or flashing light, perfect to advise more your presence. The form to seat it at your bike its, so easy. At stem, seatpost and other places of it.

Cons: The sealing for water its not so great. Cleaning the bike with water it entered inside and let it always still on. I had to open and clean the water inside. I cleaned both batteries and contacts and after that without problem

Other: No others