How's Your Dog "4-Mode" Illuminated/Glowing Nighttime Safety Dog Collar - Blue, XL (18"-25") Our Newest Design - Weatherproof, Shock-resistant and Lightweight, ideal for the active dog Constructed with comfortable rip-stop nylon, hidden power pack with handy on/off switch and a side-release buckle allows single-handed release 4 modes to choose from: Constant On, Fast Flashing, Slow Glowing, and Off Visible up to 1,000 feet in the dark, perfect for walking or jogging at night Available in 3 colors (Pink, Blue and Orange) and 4 Sizes (S,M,L,XL); This listing is for the style, color and size in the listing title