3-Mode Red Light LED Flashing Dog Collar - Red + Black (2 x CR2032)

Pros: Its very handy, perfect for a safe late night walk. Its a very good price for the collar. Ive been using it for a while and its still just as bright. It looks very well made. Its light weight which is perfect for little dogs. Its easy to clean since its made of material that can't get wet.

Cons: None that I find apart from it being a little too small for most dogs.

Other: Its all pros for it though it could be available in more sizes but the light wouldnt go around the dogs neck. It makes walks safe, cleans easily and its well made. Pretty cheap price for the quality.

Pros: Visible, in particular flash modes. I dont buy this for my dog. Instead, I adapt the thing to my helmet (roller helmet). Good visibility, and pretty cool helmet now :) 2032 are common batteries, so its gonna be easy get fresh ones.

Cons: If you need it for a dog, its one size only, fixed. It has a little elastic, but almost 1 cm difference only.

Other: Get it, cant be wrong at this price. For your dog or your helmet :D