I absolutely love this dog collar. Puppiq has made a very good dog collar that lights up a very bright blue as well as being a blue and white collar. You can get it in three different colors blue which is shown above, pink and red all also come with a usb charging cord. The sizes go from xs-large and the collar is water/weather resistant. The collar I got fits my dog Jack perfectly and the button for the lights was easy to find. It can be solid blue, flashing blue or off. I love that it is a rechargeable led collar. So i just find a usb port plug it in for a few hours while hes running around inside. Put the collar back on when its dark or when needed and hes ready to go. My dog has a habit of running off at just dark because he blends in with the driveway. Well not anymore. Its pretty hard to not spot a flashing blue light in the middle of the field or running down the driveway! I am very happy with this product and would recommend to all dog lovers. I received this product for free in exchange for my complete and honest review.