Effective indoor house mouse control with stop feed action. Each disposable bait station is pre-loaded with a 0.5 Oz. block of Just One Bite EX mouse bait. Moisture-resistant mouse bait contains bromethalin, an extremely toxic nerve poison. Due to stop feed action, house mice, Norway rats, and roof rats cease feeding after consuming a toxic dose. Effective against anticoagulant resistant house mice. EPA (Environmental Protection Agency) compliant.