Based out of Torrance, California, USA, Dogtra Company produces the world's finest e-collars. Dogtra's focus is on offering user-friendly e-collars that are designed for the most demanding training conditions. Dogtra offers a complete line of e-collars from small-breed pet trainers to a variety of sporting dog units as well as K-9 Police work. Dogtra remote training collars are some of the most effective at allowing a trainer to instantly correct a dog's mistakes at a distance far greater than leash training allows. Remote training collars are placed on a dog's neck, and allows a trainer to deliver corrective stimulation of varying strengths and types by remote.