NOT a Modem. Only a Router.

2.4GHz 300Mbps + 5GHz 300Mbps Simultaneous Data Transmission

Users can run day-to-day applications, such as e-mail and web browsing over the 2.4GHz band at 300Mbps while using bandwidth intensive or latency sensitive applications, such as streaming HD video or playing online games, over the clearer 5GHz band at 300Mbps, at the same time.