PetSafe In-Ground Deluxe Radio Fence PRF-304W In-ground radio-fence containment system for pets weighing 8 pounds or more 500 feet of boundary wire encloses area up to 10 acres; lightning protection Collar gives warning beep or static correction when pet strays into warning zone Manual and video CD included to ensure proper installation and training Transmitter measures 2 by 4-1/4 by 4-3/4 inches; receiver 3/4 by 2 by 3/4 inches