M2DG Small Area Slow Release is the ideal way to prevent foul smells from forming in boats or RVs during winter layup. Its controlled release allows it to remain effective for up to 3 months, keeping enclosed areas odor-free. Placed where air can circulate freely around it, this unit is safe for use around people and pets, making it the year-round solution to foul smells. Treats areas smaller than 1,000 cu. ft. Ideal for preventing odor in stored boats, RVs, garages and vacation homes.