Cisco ISR4431-AX/K9 ISR 4400 Router, APPX & SEC Bundle with Dual AC | eBay
Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers - Overview of the Cisco 4000 Series ISRs [Cisco 4000 Series Integrated Services Routers] - Cisco
Cisco ISR4461/K9 4400 Series Router, 2x 650W PSU | eBay