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EFFECTIVE RANGE : The ultrasonic frequency of this bird repeller is adjustable from 16KHZ-25KHZ, and the effective range is 5000 square feet (about 400 square meters), which can disperse pests and the beasts around the house comprehensively. POWERFUL FUNCTION : Ultrasonic insect repellent can provide round-the-clock protection for your yard or farm, three working modes, automatic Infrared induction: It can detect thermal objects in a straight line at a distance of 1-20m. Continuous mode: without infrared induction, it can emit ultrasonic waves continuously. Scan Mode: The gradual emission of ultrasonic waves from low frequency to high frequency. TWO POWER MODES : The animal disperser is powered by two 4C batteries or by alternating current. The detachable base can protect the machine from moisture and damage. (Battery not included) REAL-TIME PROTECTION : Unique seal and design allow you to place it anywhere. Protect day and night your garden, lawn, cabin, shed, attic, farm, barn, warehouse, yard or any other place where pests need to be controlled effectively and safely. EASY TO USE : This is a harmless repellent with multiple installation options. Whether on your wall or fence, or simply by inserting it into the ground, you can exclude rodents, seagulls, insects, rats, mice, birds, bears, deer and pests. dogs.