1. A humane and safe way to deal with moles, gophers, groundhogs, voles and other burrowing rodents, they are chased away unharmed. No chemicals are involved. 2. Solar-Powered Mole Deterrent: This mole chaser spike is powered by its solar panel. A 4-hour solar charge lasts for 5 days of working, with no need to replace the battery. 3. Extensive Coverage: Operates in a circular pattern, approximately 40 ft. in diameter. It is recommended to use 12 solar mole repeller units per acre. 4. Weatherproof Solar Mole Chaser Spikes: Pulses are emitted as 3-second pulses every 30 seconds, which penetrate the soil and force rodents to evacuate the area covered by the sound. 5. In general, it takes about 2-4 weeks to drive moles and other rodents away from the garden, and then the garden can be free of these nuisance critters after some weeks. 6. Color: green 7. Material: plastic 8. Package Contents: 8 x Solar Powered rodent repellent 9. Only the above package content is included; other products are not included. 10. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The measurement allowed error is +/- 1-3cm.