With the Victor Fly Magnet Reusable Fly Trap you can attract and trap a wide variety of flies that pester you outdoors. The attractant lures the flies into the trap but doesn t let them escape. The bait is non-poisonous so it’ s safe for use around children and pets as well as the environment. The bait the trap s white color and its diamond-shaped lid is very attractive to flies which draws them into the trap. Victor Fly Magnet bait is designed to last for an extended period of time to provide optimum fly control. Easy to use - just pour in the bait add water to the fill line and swirl to mix contents. Regularly add water to keep bait moist and so flies stay submerged. When the 1 quart trap becomes full and ready to empty you can purchase new bait separately and continue to reuse the trap. Note: The bait requires an activation period of 24 hours before it becomes fully effective.