D.T. Systems is the second-oldest manufacturer of electronic dog training collars in the world. The company has been building the world's finest, most advanced and affordable electronic training collars since 1983. The company has consistently led the industry in 'cutting edge' technology, breaking new ground at every turn. It was the first to introduce state-of -the-art digital microcomputer technology to our training collars. This sweeping technological breakthrough has revolutionized the electronic training collar industry forever. With its corporate office, service center and shipping facility located in Dallas, Texas, for nearly 20 years, D.T. Systems and its staff is always dedicated to quality, innovation and service.