Molechaser Mole and Rodent Repeller produces an underground penetrating sonic pulse of 300 Hz at 15 second intervals that pesky rodents can't stand. Sonic pulses keep your turf free of moles, voles, shrews, pocket mice, ground squirrels and other ground rodents. The green-colored control head is watertight and can be buried flush with your lawn, so it does not detract from your landscaping or interfere with your lawn mowing. Covers up to 11,250 sq. ft. The battery cylinder allows you to change the batteries without removing the unit from the soil. Uses (4) D batteries (not included). Molechaser unit is 16"L.