Innotek Lap Dog Trainer Advanced trainer with 200-yards range for small household dogs Featherweight contoured receiver; collar fits neck sizes 5 to 21 inches Compact, 6-button, hand-held transmitter weighs only 2-3/5 ounces 4 stimulation levels, plus tone-only option; waterproof; training DVD included Receiver measures 1-7/8 by 1-1/6 by 1-2/7 inches; transmitter measures 1-3/4 by 5/8 by 3-1/2 inches; limited lifetime warranty