The Magnum ScrapeDripper keeps your scrape fresh. It drips only during the day to convince a buck that a doe favors the spot only during daylight hours. Gradually intensifies scent output to get bucks even more riled up. Normally shuts down during rain and bad weather so it saves your scent. The dripper can operate for up to two or three weeks on 4 ounces of scent. No batteries required.