Solar Sonic Spikes repel moles, chipmunk and gophers without chemicals or poisons. Our state-of-the-art solar-powered ultrasonic waves repellent system effectively prevents pests from damaging your land and coming into your lawn, yard, farm or garden. They are a preventive method that also doesn’t harm the environment. Solar panel - 2V/70mAh monocrystalline silicon. Battery - 1.2V/600mAh Ni-MH battery. Frequency - 400HZ +/- 50HZ Material - ABS plastic. Switch - ON/OFF switch. To use, make a pilot hole in the ground with a wooden or steel rod. Next, insert the Spike into the soil so that the cap is flush with the ground to avoid tripping hazards and the chance of hitting it with a lawnmower, press the ON/OFF button, then it works for every day. When placed in the ground and activated, sonic pulses penetrate the soil every 30 seconds, emitting a sound which is highly irritating to moles and gophers, mice, voles, snake and other rodents. Keep your garden, yard or farm in order! Our upgrade repellers - 4pcs, these are hardware with a sensor giving vibrating a pulse working as a remover pest