Fits 12 to 16 Inch Static & Flashing Options Robust Fabric - Even for the hungriest of pooches High Visibility - Perfect for nighttime walkies! Other Sizes Available... Batteries Included Keep your dogs in sight with the Dog 'Light' Collar. With static and flashing options for those late night and early morning walkies! Available in 3 sizes, which are all adjustable, you should have no problem finding one that fits, whether it be for 'Tiny' the Zorba or 'Titus' the Chihuahua!