The repeller unit is effective at repelling Snake, by emitting asonic pulse which mice feel as a vibration transmitted through theground. The pulse is transmitted at approx 40-50 secondintervals and covers an area of approx 650sq metres.The repellertransmits its signal in all directions approx 15 m so they can beplaced approx 30 m apart in high risk areas, it is alwaysrecommended to use two or more units to get the bestresults. 1.complied with environmental criteria. 2.nochemicals.3.LED light function4.IC control, the led will trun offautomatically to save the emergy for vibration(to repel thesnakes).5.runs on solar energy,24h-autonomy withbattery. 6.weatherproof and UV-resistant. 7.Workingrange:about 650 Square metre.