ROACH-ATTRACTING PEST CONTROL: Roach Doctor roach bait attracts and kills German cockroaches with its roach-attracting formula SYRINGE APPLICATOR: easily apply the roach gel where roaches like to hide easily with the syringe tip applicator. EASY TO USE FORMULA: all you need is a small dab about ¼” in diameter of the roach killer in small spaces to start ridding your home of nasty roaches. INDOOR & OUTDOOR USE: Roach Doctor is suitable for indoor and outdoor use, making it the perfect cockroach repellent.