The Dogtra 1900S Wetland guarantees superior quality, proven by IPX9K certification the highest heat and waterproof level. It is a high output unit, precisely controlled by a Rheostat dial with 127 stimulation levels, and paired with Enhanced Contact Points to ensure the best, consistent performance in wet surroundings. The Dogtra 1900S Wetland comes with 2-hour rapid charge batteries and a LCD on the handheld transmitter that displays the battery life and stimulation level. It also includes a non-stimulating High Performance Pager. The 1900S Wetland is a 1 dog system only. Features n 3/4 mile rangen Rheostat/volume style with stimulation levels 0-127n For dogs as small as 35 lbs.n IPX9K waterproof collarn Nick and Constant HPP Vibrationn 1 dog system only