Red Flashing LED Pet Collar Pendant Safety Light - Red (1 x CR2032)

Pros: I bought this for our golden retriever who is REALLY furry. The LED is not super bright, but it does do what it says. It may be better for dogs with a little less fur. The battery lasts forever, so no need to worry about changing the batteries often. Also, it seems to be sealed for waterproofing. I didn't try submerging in water, but my dog was in rain and snow with no effect on the light

Cons: The quality is quite bad. Actually, I think the "operation" and methods used to contruct it is poor. This light is suitable for small dogs who dont run around a lot. I'm not sure why, but the light keeps turning itself off when my dog runs around. The design of the internals is not very done well. You must press the entire light, because the entire light is the button

Other: Get this if you need a light for your smaller (less than 20lb) dog who will not run too far away or too fast.