To combine with 901N audio entry system.
| Make | Bell Systems |
|---|---|
| Manufacturer | Bell System (Telephones) Limited |
| Model code | SPA3-S |
| Panel Type (separate) | Audio Panels |
| Mount Type | Surface Mount |
| No of Call Buttons on Panel | 3 call buttons |
| Panel Material | Aluminium |
| Additional info | To combine with 901N audio entry system. |