Wildlife Research #381 Magnum Scrape-Dripper is the smart dispenser that keeps a scrape fresh and working. It drips daytime only, to get bucks to come during daytime hours. It can operate for up to two to three weeks on four fluid ounces of scent, depending on temperature swings. This dripper gradually intensifies the scent output to get bucks even more riled up! It will normally shut down during rain and bad weather, so it saves your valuable scent. No batteries required.