A Supra lockbox in real estate is a secure, Bluetooth-enabled key container that a listing agent attaches to a home for sale so that other licensed agents can retrieve the house key during showings. Instead of a shared combination, the box opens only when an authorized agent uses the Supra eKEY app on their phone, and every opening is logged with the agent’s name, date, and time. It is the most widely used electronic lockbox system in residential real estate.
How the Box Actually Opens
The current hardware is the iBox BT LE, a weather-resistant unit that clips onto a door handle, railing, or gas meter. It talks to the eKEY app over low-energy Bluetooth, with no extra fob or adapter needed.1Honeywell. iBox BT LE Electronic Lockbox Inside is a key compartment sized for up to five keys, or two gate cards plus two keys.
At the property, the agent turns on Bluetooth and location services, opens the app, and enters a four-digit PIN. A firm push up on the bottom of the key container wakes the box’s sensor and starts the Bluetooth handshake. Once the app shows “Successful,” a second push releases the key compartment.1Honeywell. iBox BT LE Electronic Lockbox
The exchange is encrypted. Unlike an old combination lock, there is no static code floating around that someone could pass to a friend or guess. The system records every access in a central database, which gives the seller and listing agent an automatic audit trail for every entry. A long-life lithium battery powers the unit, and when it eventually fails, the local association that leased out the box typically handles the swap.
Who Is Allowed to Open One
Access is restricted to people with active professional credentials. That generally means licensed real estate brokers and agents, and in some areas certified home inspectors and appraisers. To get an eKEY, you usually need active membership in a local Multiple Listing Service or REALTOR association.2National Association of REALTORS. Lock Box Section 1 – Lock Box Security Requirements MLS Policy Statement 7.31
National Association of REALTORS policy is explicit on sharing: keys may not be used by anyone other than the individual keyholder, except where specifically allowed under local lockbox rules.2National Association of REALTORS. Lock Box Section 1 – Lock Box Security Requirements MLS Policy Statement 7.31 An agent cannot hand the phone to an unlicensed assistant to open a lockbox, and cannot pass their PIN to another agent. Those terms sit inside the lease agreement each keyholder signs with their local association.
What the Seller Controls
A listing agent cannot put a Supra box on your property without your say-so. MLS policy requires authorization from both the seller and any occupant before a lockbox is placed, and even in markets where the MLS mandates lockboxes on every listing, that mandate only applies to properties where the seller has agreed.3National Association of REALTORS. FAQ on Mandatory Placement of Lock Boxes You can decline. The tradeoff is that every showing then has to be coordinated manually through your listing agent.
Sellers who want the convenience of a lockbox but not open access can ask for a Call Before Showing (CBS) code. When CBS is turned on, the PIN and Bluetooth handshake alone will not open the box. The app also asks for a code that the showing agent has to get by calling the listing agent first.4SupraNET. Call Before Showing CBS This forces a conversation before each entry, which matters for occupied homes, homes with pets, or sellers who simply want notice. Certain affiliated users — home inspectors, pest control technicians, termite inspectors — always need a CBS code even when the listing agent has not turned on the restriction for regular agents.
Setting Up and Using the eKEY
Before anyone can open a box, the agent has to activate the eKEY app on their phone. The steps are straightforward:
- Sign the keyholder lease agreement with the local MLS or REALTOR association, which spells out the no-sharing rules and your financial responsibility if a box is lost or damaged.
- Download the eKEY app on iOS or Android. The phone needs at least iOS 10.0 or Android 8.0 with Bluetooth enabled.
- Register with your email address and a four-digit PIN you choose, then use the authorization link the system sends by email or text.5tbrnet.org. Single Access With eKEY Instructions for Users
- Provide your real estate license number, office identification code, and verified contact details to tie the app to your professional profile.
Supra offers two subscription tiers through the local association: eKEY Basic at roughly $20 per month, and eKEY Professional at roughly $31 per month plus a $50 activation fee. The Professional tier adds showing notifications and feedback tools.6Supra. Supra eKEY Comparison Chart 2025-2026 Local associations may add their own fees.
One practical note for agents heading to rural listings: the eKEY app needs a cellular or Wi-Fi connection for normal use and refreshes its credentials at least once every 24 hours. If the credential is stale and you have no signal at the property, the box will not open.
What the Seller Sees
Supra can send email or text notifications every time a lockbox is opened, and with eKEY Professional, when the showing ends. The listing agent configures these alerts through the SupraWEB portal and can include the homeowner, a partner, or a managing broker as additional recipients. For a seller who wants to know who is in the house and when, that is near-real-time visibility.
Listing agents can also pull detailed showing reports going back 180 days, including which agent opened the box, exact dates and times, and any feedback left after the showing.
What Happens When Someone Misuses It
Lockbox rules have teeth. Under NAR policy, local associations and MLSs can impose fines of up to $15,000 per violation, and they define what counts as a violation.2National Association of REALTORS. Lock Box Section 1 – Lock Box Security Requirements MLS Policy Statement 7.31 Common infractions include sharing a PIN, letting an unlicensed person use your phone to open a box, entering outside the terms the seller approved, or failing to return the key to the box after a showing.
Ethical complaints are also possible under the NAR Code of Ethics. Article 3 requires listing agents to provide timely access when it serves the seller’s interest, and cooperating agents cannot misrepresent that they have permission to enter a property.7National Association of REALTORS. Code Comprehension – Article 3 Misrepresenting the Availability of Access to Property Entering through a lockbox without proper authorization can also amount to criminal trespass under state law, typically a misdemeanor and potentially a felony if the home is occupied when someone enters.
If a leased box is lost, stolen, or damaged, the keyholder owes a replacement fee set by their association, and a managing broker may share that cost under the lease. Unresolved issues can lead to MLS suspension and eKEY deactivation.