This sturdy, weather resistant case is made especially for the iTrail GPS Logger (or anything you else would like to keep in a weather resistant box), The heavy-duty magnet on the bottom will ensure that the GPS box stays firmly attached underneath your vehicle, Weather Resistant, Heavy Duty 30# magnet, Size: 2"" x 2"" x 1"", Includes: Magnetic Mounted Case, SKU: KJB645