"Just push the 12in. stake into the soil. Unit broadcasts sounds and vibrations every 15 seconds. Waterproof. Uses 4 D batteries, not included. For a larger lawn, order several. Power Source Battery, Includes Sound/vibration every 15 min., Indoor/Outdoor Use Outdoor, Assembly Required No, Removal Of Burrowing rodents, Dimensions L x W x H in. 11 x 12 x 2 3/4. Frequency 250A, 500 HZ Repells Ground Squirrels Shrews Voles Kangaroo Rats Moles Mice Gophers Battery Life Approximately 3 to 6 months"
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