The Dogtra 1900S BLACK EDITION is the 1-mile, single-dog version of our bestselling 1900S e-collar, known for its versatility and IPX9K durability, making it the tool of choice for trainers in extreme conditions at extreme ranges. The 1900S BLACK EDITION's receiver is also IPX9K waterproof certified, the highest heat and waterproof level. With its longer range and proven durability, the Dogtra 1900S BLACK EDITION comes with a premium matte black finish and blue LED lights for enhanced tactical fit and aesthetics to excel in the most demanding training conditions for competition or K9 training. (Previously known 3500NCP/3500X series)