This handy clip on pet collar light created by Tech Tails is great for taking your pet for a night walk. It has 3 settings, solid light, fast flash, and slow flash, that are easy to change. You just simply press the light and it switches between the settings. It is made of a good water proof silicone type material so you don't need to stress about the durability. It comes with a watch-type battery which is convenient since batteries can be pretty pricey depending on the type.
When the time comes to replace the battery you just simply separate the silicone case and take out the LED light mechanism, replace the battery, and assemble it back together. There are no difficult clips or screws to remove making the switch fast and easy. The only thing I would suggest is that the collar light is not great for small pups since it is a bit on the bigger side. I absolutely recommend this product to any pet owner.