With most products, you can add additional door openers or doorbells to expand the system or replace parts.
The table below shows which parts are compatible/exchangeable. You can check the model number of the system you are currently using on the back of it.
Exemple:
| The code of the product starts with: | Compatible with: |
| RX, SX or SXi (RX85, SX80, SX201i.....) | These have been discontinued, and are not compatible with other Byron doorbells. |
| DBxxx range (DB301, DB302, DB333….) | Door button not available separately. Compatible with other DBxxx and Bxxx doorbell series from after 2014 |
| Bxxx range (B304, B305, B322....) | Door button not available separately. Compatible with other DBxxx and Bxxx doorbell series from after 2014 |
| BYxxx range (BY101, BY202, BY301, BY401….) | Compatible with all BYxxx model doorbells. Look for the logo below on the packaging  BY30, BY32, BY33, BY34, BY35 & BY37 |
| DBY-xxxx range (DBY-23512, DBY-22321, DBY-22311....) | Compatible with all DBY-xxxx models working at 433mhz. Look for the logo below on the package  DBY-23510 & DBY-23610 |