The durable 1900S e-collar features a 3/4-mile range and is fully waterproof. The receiver has a unique modern design that lets the collar strap wrap around the receiver and your dog’s neck for enhanced comfort and seamless appearance. The Dogtra 1900S receiver outputs low-high stimulation from 0-127 levels, a wide range of stimulation that will fit any dog’s personality from mild to most stubborn. Using a patented Rheostat Dial, the gradual and precise stimulation control is displayed on the illuminated LCD screen on the handheld transmitter. The 1900S is also available in the 2-dog system, the 1902S.