Four Sonic Mole Chasers Mean No More Moles In Your Yard FOUR 4 sturdy P3 International high impact ABS plastic mole chasers for mole and gopher control are weather proof and proven effective. Get rid of gophers , too. Mow-over design bury flush with ground and set mower at 3 inches or higher. P3 7901 black sonic mole chaser stakes are 100 per cent waterproof with a screw on top. The pull out battery cylinder makes changing batteries easy. Uses 4 D cells, not included. Battery life is 4-6 months. Each weighs about 9 oz. without batteries. Dimensions 15 x 1 3/4 diameter. Frequency 300 Hz. Duty Cycle 15 seconds Coverage 9,000 sq. ft. 1/5 acre Maximum, depends upon soil. Limited Lifetime Manufacturer's Warranty. Penetrating sonic pulses of 300Hz at 15 second intervals irritate moles, voles, and gophers and send them scurrying away. Bury flush with lawn for easy mowing. The Molechaser Mole Control stake is the easiest and most environmentally gopher repellent and mole repeller. For up to 1/5 acre. Effectiveness depends on soil. NOTE Do not expect instant results. Use continuously for 7 to 14 days before effective gopher control or mole control is seen. Initially, the Mole Chaser can cause increased pest activity. Gopher pests and moles can mistake currents as a food source gophers and moles leave when they realize the currents are not food. Make sure earth is firmly packed around each stake. DO NOT POUND INTO GROUND. Loosen or wet soil. Push MoleChaser into ground. Pack soil tightly around MoleChaser.