The Dogtra 1900S e-collar is designed for maximum durability and comfort. The waterproof receiver features a modern design and straps around your dog's neck for a secure fit. With 127 stimulation levels, it offers a wide range for any dog's personality or temperament, controlled by a precise Rheostat Dial. An illuminated LCD screen on the handheld transmitter displays the stimulation level. Easily increase or decrease the range up to 3/4 of a mile.