The Sonic Shield pest control device from Bird-B-Gone frightens birds and other unwanted critters away from property using sound and light. Self-contained and completely portable, it operates on four AA batteries and is easily installed virtually anywhere. The device has two modes of operation for around-the-clock pest deterrence: a daytime mode to repel pests using flashing LED lights and barking dog sounds; and a nighttime mode that repels pests using only the flashing LED lights — ideal for areas where night noises are not allowed. For more information visit www.birdbgone.com or call (800) 392-6915.