High-technology to combat voles, shrews, field mice & moles. Every 18 seconds, the device emits a noise at a frequency of 300 Hz as well as a vibration from the patented motor contained inside the device. This additional movement improves the efficiency of the device. The sound & vibration repels the damaging pests over an area of around 1250 m 2. This protects your newly planted flowers & garden. & since no chemicals are used, there is no danger to humans or useful garden fauna. The device can be fully inserted into the ground, thus making mowing easier. Even in rain, the Anti-Vole device is protected against water ingress. Up to 6 months operation.