Used Cisco IPS 4270 Sensor Appliance

Part # IPS-4270

Product Description: Cisco IPS 4270 Sensor  Series - This inline network security appliance provides up to 4 Gbps of intrusion prevention performance. With optional fiber or copper NIC cards for as many as 16 interfaces, you can monitor multiple segments for malicious traffic.

Cisco IPS 4200 Series Sensors
Cisco Security / Firewalls - Listed Alphabetically