| Product Code | ISR4331-SEC/K9 |
| Aggregate Throughput | 100 Mbps to 300 Mbps |
| Total onboard WAN/LAN ports | 3 (10/100/1000Mbps) |
| RJ-45 ports | 2 |
| SFP ports | 2 |
| Service Module Slot | 1 (SM-X) |
| NIM Slots | 2 |
| Memory | 4 GB (default) / 16 GB (max) |
| Flash Memory | 4 GB (default) / 16 GB (max) |
| Power Supply | Internal: AC and PoE |
| Dimensions | 44.45 x 438.15 x 438.15 mm |
| Weight | 12.96 Kg |