To combine with 901N audio entry system.
| Make | Bell Systems |
|---|---|
| Manufacturer | Bell System (Telephones) Limited |
| Model code | SPA18 |
| Series | SPA Series |
| Panel Type (separate) | Audio Panels |
| Mount Type | Flush Mount |
| No of Call Buttons on Panel | 18 |
| Panel Material | Aluminum |
| Additional info | To combine with 901N audio entry system. |