The RESCUE!® Non-Toxic Yellow Jacket Trap Attractant Refill with 10-Week Attractant Cartridge works inside the RESCUE!® Reusable Yellow Jacket Trap to lure all major species of yellowjackets. It uses no poisons or pesticides to lures the queen and worker yellow jackets. The attractant works up to 10 weeks so you don t have to constantly re-bait your trap. Attractant comes in a no-mess preloaded cartridge simply insert in the Rescue! Yellow Jacket trap for outdoor use.