LED Flash Collar Size: Small (12" - 18"), Color: Yellow Our Newest Design 2010 - 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, Green and Yellow) and 3 Sizes (S,M,L); This listing is for the style, color and size in the listing title