A humane and safe way to moles, gophers, groundhogs, voles and other burrowing rodents, they are chased away unharmed. No chemicals or .Solar-Powered Mole Deterrent: This Mole chaser spike are by its solar panel. 4-hour solar charge lasts for 5 days working, no need to replace battery. Extensive Coverage: Operates in a circular pattern, approximately 40 ft. in diameter. So it is recommended to use 12 solar mole repeller units per acre. Weatherproof Solar Sonic Mole Chaser Spikes: Sonic pulses emitted 3s sonic pulses for every 30s, it penetrates the soil for and forces to evacuate the area covered by the sound. In general, it need about 2-4 weeks to drive the Mole & away from your garden, Then your garden will be free of these nuisance critters after some weeks Color: green Material: plastic Package Contents: 8 x Solar Powered rodent repellent Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.