ECollar Technologies has many products to choose from. We have full sets 1 dog, 2 dog, 3 dog and 4 dog sysyems, mini educators, pagers and bark collars. If you have a working dog, Hunting dog or Competition dog, these fit any and all needs and is a great tool to have. We carry replacement parts as well: Collars, Contact Points, Batteries, Chargers, Componets.