Deer Off deer repellent is the only product of its kind with a patented weather-proof housing that protects the powerful deer repellent from the elements, allowing you to apply them just once per growing season. The rugged housing is specially designed to keep water out of the station while allowing air to travel through, spreading the repellent scent across your yard or garden for an effective defense against deer.Apply once for season-long protectionPatented weather-proof casing protects repellent from the elements100% dried blood triggers flight mechanism in deerDries odorless to humans