Stylish Print Adjustable LED Lighted Flashing Dog Collar Sturdy nylon 1" adjustable band with heavy plastic interlocking closure for easy closure and removal Waterproof & shockproof fun speckled leopard printed design by day, and lighted brilliance in darkness for your dog's safety Three convenient sizes: Small - fits up to 14-15", Medium - fits up to 18-19", and Large - fits up to 22-23" 4-way LED button light hidden within collar (included): Flashing-Blinking-Solid On-Off When determing size, collar should be snug enough to fit 2 fingers between the dog's neck and the collar