The LED safety necklace can be easily cut to fit, making it perfect for both big and small dogs. Provides a full ring of illumination around your dog's neck and can be set to glow or flash mode to keep your furry friend safe and seen at night. Makes a bright LED addition to an existing collar. Made with flexible polymer illuminated by 2 bright LEDs (red. green or blue) and simply slides over your dog's neck for hours of nighttime fun and safety. Universal sizing: cut to fit from 12" to 27". Just trim the tube to a custom fit, give the button on the durable, weather resistant housing a quick press and the entire collar lights up a full 360 degrees, making your dog clearly visible from all angles. Battery run time of 60 hours. Dimensions: adjustable length 12" - 27" x .3". Weight: 2.1 oz.