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 suitable 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 suitable for every 30s, it penetrates the soil suitable for and suitable 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.