The QuadBlaster QB-4 ultrasonic bird control device from Bird-X gets rid of bird infestations with a "silent to humans" audio attack. The sounds are designed to confuse, disorient, and intimidate pest birds to quickly scare them away from the effective area. Birds will not linger while exposed to this sound. Features include four built-in speakers to emit high-frequency sounds, can be used indoors or in semi-enclosed spaces, easy to install, and covers up 6,500 square feet. For more information call (800) 662-5021 or visit www.bird-x.com.