This repellers are designed for garden or farm to repel rodent and snake. Adopted with sonic w-ave technology 30s underground to frighten animals within 200-250©O. Using them, no need to worry about pollution or food p-oisoning. As the repellers are solar powered, there is no wiring needed. Comes with sensitive light control for convenient & user-friendly experience. Just stick them into ground and you have your field protected. Features: SOLAR POWERED: Energy saving, no wiring to install, stick and play. SENSITIVE LIGHT CONTROL: Comes with sensitive light control, absorbing sunlight during day & provides you illumination for s-afe walk at night. 200-250©O P-ROTECTION AREA: Repel pest within 200-250©O, practical for garden and farm. LONGLSTING USE: Built-in 600mAh high capacity rechargeable cell and support long-hours constant working. PHYSICAL REPELLENT: No p-oison, no chemical, repelling pest via sonic wave, safer to use. Specifications: Solar panel: 2V 100mA Cell: 1 * 1.2V 600mAh