> ## Documentation Index > Fetch the complete documentation index at: https://docs.rentsmart.com/llms.txt > Use this file to discover all available pages before exploring further. # How Codeboxes work > RentSmart digital lockboxes, the linking process, and what they enable. A **Codebox** is the digital lockbox RentSmart uses to enable [Self-Access showings](/showings/self-access). Install one on the door, and leads can tour the property on their own using one-time access codes. RentSmart partners exclusively with **Codebox** as its hardware provider — "codebox" and "lockbox" are used interchangeably throughout RentSmart. ## Two ways to get a lockbox Both options end with the same capability: * **[Buy a new Codebox](/lockboxes/buy-codebox)** — \$100 + shipping per unit. Ships pre-configured to your codes; pairs to your account automatically on arrival. * **[Link an existing lockbox](/lockboxes/link-existing)** — free. Connect a Codebox you already own from another platform. Linking takes up to **7 business days**. You'll want at least one lockbox per property you plan to run as Self-Access. ## What lockboxes enable A lockbox assigned to an active property unlocks (literally) the Self-Access showing flow: 1. Leads book a showing 2. At showing time, RentSmart texts the lead asking for the **last 4 digits of the serial number** (confirms they're on site) 3. RentSmart texts back a **one-time access code** 4. Lead tours, locks up, returns the key to the lockbox 5. Post-showing cleanup SMS goes out automatically You don't need to be there. ## Three codes on every Codebox Every Codebox has three codes: * **Shackle Code** (5 digits) — releases the shackle so you can physically place or remove the lockbox from the door * **Door Code** (5 digits) — master code that opens the lockbox door. **Leads never see this** — they get unique one-time codes. * **Admin Code** (6 digits) — for changing Codebox settings on the device itself You set these during Buy or Link. You can change them later via the **Settings** button on the Lockbox card (and you'll need to manually update the physical device to match). ## Lockbox statuses Every lockbox is in one of six statuses at any time. The full reference is on [Lockbox statuses](/reference/lockbox-statuses), but the short version: * **Processing** — newly ordered or linked, being prepared * **Shipped** — bought lockbox is en route to you * **Connected** — activated and assigned to a property * **Unassigned** — activated but not currently on a property * **Removal** / **Return** — being removed from your account ## Where to manage lockboxes The [Lockboxes page](/lockboxes/manage) at [app.rentsmart.com/lockboxes](https://app.rentsmart.com/lockboxes) shows every Codebox on your account with status filters and per-card actions. Order new units pre-configured for your account. Move a Codebox from another provider to RentSmart.