The Cisco Meraki MA-MOD-4X10G 4-Port 10G SFP+ Module is a plug-in expansion module specifically designed for the Cisco Meraki MS390 switch. It provides 4 ports of 10 Gigabit Ethernet connectivity through SFP interfaces, with a maximum LAN data rate of 10 Gbps. This module is ideal for enterprise networking setups that require high-speed, wired-Ethernet connections. With its partially managed network management type and compact form factor, it offers a convenient and efficient way to expand the network capabilities of your Meraki switch.