Flexzion Solar Powered Pest Repeller Ultrasonic Mice Mole Mouse Gopher Insect Rodent Repellent for Outdoor Lawn Garden Yards with Rechargeable Battery 650 Square Meters Coverage A Ni-Cd Rechargeable battery is included to operate the solar cell to collect solar energy to power the repelled during daytime Radiates in all directions with frequency of 400HZ to 1000HZ and effective range of 6000 square feet or 650 square meters Keep moles, gophers, voles, badgers, mice, ferrets and mongoose away from your lawn, gardens and yards forever Rechargeable Battery: Ni-CD / Ni-MH, can recharge more than 600 times Chemical free, safe to human and pets