MouseX is effective for both indoor and outdoor mouse and rat control, MouseX Ready Trays won't harm pets, people, or wildlife when used as directed. And because the active ingredient does not affect animals other than mice and rats, there's no risk of secondary poisoning or death if predator animals accidentally take away the rodenticide or consume a pest that has eaten from the tray. MouseX Ready Trays are pre-measured bait trays that make baiting easy. Just peel off the bait tray cover and set the MouseX Ready Trays out wherever you see mouse activity.