Battery-operated device emits pulsating vibrations through the ground to repel moles by simulating potential predators. Frequency 400Hz +/-100Hz. Size 290 x 50 x 70mm. Covers area up to 850m2. Requires 3 x D batteries. Battery-operated device emits pulsating vibrations through the ground to repel moles by simulating potential predators. Frequency 400Hz +/-100Hz. Size 290 x 50 x 70mm. Covers area up to 850m2. Requires 3 x D batteries.