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- This ultrasonic rodent repellent equipped dual microchip system it is effectively protects an area measuring 5 000-6 000 unobstructed Sq. Electronic Mouse Repellent Ultrasonic Squirrel Repellent Indoor Rodent Repellent Feature: - Frequencies ultrasonic & electronmagnetic waves simulate and interfere with the auditory and nervouse systerm of the mouse makes mouses feel uneasy and uncomfortable ensure that the pest can t develop immunity and adaptability.5 inches (W) x 5.