Contains insect growth regulator. Prevents reinfestation of cockroaches for up to 6 months. Effectively eliminates cockroach populations by preventing reproduction. Keeps working on cockroaches for 6 months. Innovative dry spray. No odor. No mess. No roaches. Bengal Gold Roach Spray prevents nymphal cockroaches from becoming egg laying adults. Powerful flushing action drives insect out of hiding and kills them. One treatment does it all - flushes and kills. Guaranteed: Guaranteed to work or your money back.