Deer Chaser protects your home and family from intrusive deer. This proprietary technology, developed and field tested by a Ph.D. and author of several books, will gently ward off deer keeping them at a safe distance from those expensive plants and shrubs. Keeping deer at a safe distance from our plantings is one of the more difficult obstacles that Mother Nature has cast upon us. That, coupled with the fact that deer carry ticks that spread Lyme disease and other diseases that afflict humans, is the perfect reason for Deerchaser. Engineered with special sound level and light intensity to scare away deer but remain unobtrusive to humans; Wide angle of sensitivity, up to 25 feet from the unit, can protect an area or redirect deers' path of travel away from garden plants; Effective year 'round; simple battery operation (3 D cells) means that you do not need to bring either water or electricity to area that you need to protect.