| Model | Zyxel USG FLEX 500 |
| 10/100/1000 Mbps RJ-45 ports | 7 (configurable), 1 x SFP (configurable) |
| USB 3.0 ports | 2 |
| Console port | Yes (DB9) |
| SPI firewall throughput | 2,300 Mbps |
| VPN throughput | 810 Mbps |
| VPN IMIX throughput | 240 Mbps |
| IPS throughput | 1,500 Mbps |
| UTM throughput (Anti-Malware and IPS) | 800 Mbps |
| Max. TCP concurrent sessions | 1,000,000 |
| Recommended gateway-to-gateway IPsec VPN tunnels | 150 |
| Max. concurrent IPsec VPN tunnels | 300 |
| Concurrent SSL VPN users | 150 |
| VLAN interface | 64 |
| SPI firewall throughput | 935 Mbps |
| VPN | IKEv2, IPSec, SSL, L2TP/IPSec |
| Power input | 12 V DC, 4.17 A |
| Max. power consumption | 24.1 Watt Max |
| Heat dissipation | 82.23 BTU/hr |
| Packing Dimensions (WxDxH) (mm/in.) | 351 x 152 x 245/13.82 x 5.98 x 9.65 |
| Packing Weight (kg/lb.) | 2.83/6.24 |
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