Used Cisco IPS Sensor Appliance

Part # IPS-4260

Product Description: Cisco IPS 4260 Sensor Series - This inline network security appliance  provides 1 Gbps of intrusion prevention performance. With optional fiber or copper NIC cards, you can monitor multiple segments for malicious traffic, making the most of your intrusion prevention investment.

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