These long range antennas are heavier duty than the ones that originally come on the DC30 and DC40 collars. They are have better range and come in 5 bright colors - neon green, neon yellow, neon orange, neon pink, or black. These antennas are 20 inches long. For use with Garmin Astro DC40 and Garmin DC30 dog tracking GPS collars. 1 year manufacture warranty, minus dog chews or hog damage.