I love this collar. I have 2 dogs one is a Chihuahua mix and the other is a pit bull. Both dogs can actually wear this same collar. It is adjustable. This also has 3 light modes. The modes are solid, flashing and multi colored. The color is very secure with the plastic clasps. It is a nylon color. The collar is 2 1/2 cm wide. The lights on the collar work with 2 CR2032 button batteries.Which are included. This collar seems to be very well made and should hold up for a long time. Not sure how long the batteries will last but CR2032 batteries are pretty popular, so shouldn't be hard to find replacements.
I received this product for free or at a discounted price in exchange for an honest and unbiased review.