The BioCare Flea Trap Capture Pads last for up to 3 months or until filled with up to 10000 fleas. Package contains 3 capture pads. Fleas are attracted to the heat and light. They jump towards and onto the trap falling between the grid to land out of sight on the sticky below. Simply dispose of the old capture pad from the trap. Peel the paper cover from the sticky and place into your trap.