The 1900S is the all around collar from dogtra. The Dogtra 1900S dog system has a 100% waterproof collar features a 3/4 mile range along with Nick and Constant stimulations. It also offers non-stimulating high-performance pager. This dog system has water excelling enhanced contact points with 2-hour quick charge. The LCD on the handheld transmitter displays the battery life and stimulation level.