Bonide MoleMax Mole & Gopher Repeller 90067 No more poisons, traps, or gases; safe for the environment, and around children and pets Easy to use - simply place in ground, then wait approximately 10-days for results Uses 3 replaceable "C" cell batteries that last up to 18 months per use (not included) Each unit covers up to 3,600 square feet Durable for all weather conditions