The solar pest repeller uses the principle of ultrasonic wave vibrations: the repeller emits ultrasonic waves in the frequency range of 400 - 1000 Hz, which are inaudible to humans and pets. Ultrasonic waves in this frequency range irritate the auditory organs and nervous system of common garden pests, such as moles. Every 40 seconds, the device emits ultrasonic waves that cause vibrations in the top layer of the soil. The impulses generated in this way repel pests. Equipped with a solar panel to convert sunlight into energy stored in the built-in battery. Placing the device in locations with the most sunlight conditions its optimal functioning. For optimal results, it is recommended to install repellents at 20-meter intervals.Product Features: - built-in battery 1.2V 600mAh solar-charged - effective range area approx.: 1000 m2. - material: durable plastic - emits sound + vibrations every 40 seconds - harmless to humans and animals - height approx.: 28 cm - handle diameter: 3 cm - top diameter: 12 cm Quantity pcs. on the palette: 528