The San Antonio Board of Realtors is hosting a Supra Lockbox and Supra Key exchange this week. As a home Seller or Buyer these supra keys are important to you. The Supra Lockbox has advanced in technology. The newest and only lockboxes that will work now, are blue. They have controls to keep the box from opening during the night, and keeps a record of who opens the lockbox. The least secure boxes are combos. I strongly advise against using combos, especially if the home is occupied.
I traded in my old Supra Key to an E Key for my iPhone which is an asset to my Buyers. It automatically updates! Yea! No more mundane, slow updates, but it will always be ready to open those lockboxes. If I’ve shown you very many homes, you will have watched me be torchered at least once by an update. 
The new E Key also has additional technology that I will learn more about as I use it.
I just love how Real Estate embraces new technology!–Katie