E-Collar EZ-904 1/2-mile range trainer for small to medium sized dogs 10 pounds and up with neck size 5 to 22-1/2 inches is loaded with unique features, making it the most humane and effective trainer available LCD display with backlight allows for precise control 256 levels of smooth "blunt" stimulation with 100 Levels displayed on the LCD Five stimulation modes to choose from Your complete satisfaction is our only concern. We offer a two-year warranty on registered products against manufacturer defects (one-year on accessories) with free live US phone support.