The Safer DeerOff Waterproof Deer Repellant works to protect your yard from deer destruction. The formula of the deer repelling stations contains 100% dried blood, which releases a scent they fear. The smell mimics that of a dead or decaying animal, which triggers the deer's flight response and trains them to stay away. The intense scent deterrent is easily detectable by the heightened senses of deer, but is odorless to humans. DeerOff deer repellant lasts the entire growing season thanks to patented weatherproof housing stations that protect the active ingredients inside. The deer repellent is ready to use and comes with 6 stations and 6 stakes to conveniently stake your repellent into the ground. You can also hang deer repelling stations from fencing or low-lying shrub, or place them in a flowerpot or flowerbed. For best results, places stations no higher than 2 ft. above ground level, and no more than 4-6 ft. apart. One 6-pack covers up to 192 sq. ft. for up to 90 days.