Every month SentriLock, LLC. provides NAR Research with data on the number of properties shown by a REALTOR®. Lockboxes made by SentriLock, LLC. are used in roughly a third of home showings across the nation. Foot traffic has a strong correlation with future contracts and home sales, so it can be viewed as a peek ahead at sales trends two to three months into the future. This infographic shows the latest index data along with trends and changes.