Cisco 1900 Series Integrated Services Routers (ISR) are designed to meet the requirements of small branches. This Products Family currently consists of the 1905, 1921, 1941 (Internal Services Modules), and 1941W (wireless, 2 Compact Flash cards) models. It's worth mentioning that the 1941W is Wi-Fi CERTIFIED™ and 802.11a/b/g/n-compliant. The Cisco 1900 series can offer at least 2 GE integrated WAN ports, 2 EHWIC Slots, and 1 SIM slots. Furthermore, most of their RAM is 512 MB(default) to 2 GB(max) and the Flash Memory is 256 MB(default) to 4 GB(max). The Cisco 1900 Series enables deployment in high speed WAN environments with concurrent services enabled up to 25 Mbps.