IT COSTS YOU LESS TO STAY BUG-FREE! Identical to the red can Roach Spray except Pyriproxifen (an insect growth regulator) has been added. The comments for the Original Bengal Roach Spray apply to the Gold products as well. It has been found that 0.02% is an acceptable level for cockroach control but Bengal Gold contains 0.05%, which ensures that our product will perform as a premium product even when the application is not done perfectly. Pyriproxifen content in Bengal Gold® is the highest of any spray product on the market. It remains active on surfaces in the home for 6 months or longer. Pyriproxifen is a synthetic insect hormone and has no effect on people or animals. Pyriproxifen breaks the life cycle by sterilizing adult cockroaches - makes them unable to reproduce. Prevents immature roaches from developing into breeding adults. It's birth control for roaches! Cockroaches that have been affected by Pyriproxifen will sometimes be mutated and have twisted or bent wings. These roaches are sterile. If you see these roaches, it is evidence the product is working and has sterilized the pests. A professional pest control (PCO) service that sprays monthly or at other regular intervals with the same pesticide will cause the surviving roach population to develop a tolerance to the chemicals, which will then be less effective. The large percentage of active ingredient in Bengal and the Pyriproxifen helps to overcome this problem. Roaches are not resistant to Pyriproxifen since it imitates a naturally occurring hormone in their biological system.