Blazin' Security! Outstanding visibility of 350 yards. Be seen by traffic and save your pet's life. Top Technology! Slimmest individual bulb strip and on/off box. Cheap collars have short inconsistent LED strips or bulbs too big to slide through sizing clips. Don't let your pup look silly with a half lit neck when we offer 360 degrees of illumination. Lithium ion battery saves money and offers extended use without the hassle of buying strange batteries. Charge From Any Device! Runs over 8 hours. Track your glowing pet when camping, in the backyard, on evening hikes or when lost at night. Quality Construction! 3 modes (on, strobe, blink). 1? wide high tensile nylon. Any time, any weather, illuminate and protect your canine. Available in assorted colors. Also available is the Blazin' Leash. Size: Adjustable strap for perfect fit. Our four extended sizing options give you more leeway in selecting a size, overlapping each other so you don't have to guess if your pup is between sizes. Xsmall, Small, Medium and Large are easily adjustable for extra small or extra large pets, even XXL. XS - 8.1 inches to 10.75 inches Small - 9.8 inches to 14.2 inches Medium - 13.8 inches to 19.7 inches Large/XL - 19.3 inches to 27.6 inches Assorted colors: Blue, Red, Black, Purple, Green and Pink. Even fits larger cats.