BARGAINROLLBACK Combo LED Collar & LED Leash Flashing Light up, Glow and Bright (Ships from USA) LED Collar and LED Leash COMBO , Battery is replaceable. ( this item ships from USA with Tracking) 3 different LED light Glow settings to choose from- Blinking, strobe, or normal glow. Please remove the battery strip under the housing battery prior to first use. X-Small: fits necks 8-12.5 Small: fits necks 13-17 Medium: fits necks 15.5-19.5" Large: 1" fits necks 17.5-23" X-Large: fits necks 22-27.5" ''Be safe, be SEEN" also applies to our four-legged friends! Glow Doggie Glow!