I purchased this to replace an old silica bag dehumidifier in my medium sized gun safe. It essentially works the same, and provides the same protection. The big difference with this item is the ability to plug it into an outlet to recharge. The older bag required a substantial period of time in a heated oven, which was grossly inefficient and a substantial pain in the rear. With this item, when the color indicator changes indicating the need for a recharge, you simply plug it into an outlet until the color changes back. Much easier. I would recommend this for anyone looking for the convenience described and without the ability or need to use an electric probe dehumidifier.