The bob martin flea tick collar effectively fights fleas and ticks preventing them from spreading and working quickly against them at any point in their life cycle the collar traps fleas and ticks making them unable to move and thus helping prevent your pet or home becoming infested it does not contain any toxins or biocides meaning that this collar is harmless to humans animals and the environment the waterproof bob martin flea tick collar is effective for up to 6 weeks against pests