NETGEAR Nighthawk Multi-Gig speed Cable Modem for XFINITY Internet & voice delivers Gigabit speed Cable Internet and the best call clarity. This first-to-market DOCSIS 3.1 cable Modem with voice supports all of today's Internet service plans and is designed for high-performance Internet in the future. It includes two telephone ports that automatically prioritize voice-over-internet for clear and uninterrupted calls. It provides enhanced call features like 3-Way conference calling, caller ID, call forwarding and more. It includes Gigabit Ethernet ports (with LAN Port aggregation) for faster wired connections. It can save up to $120 per year on monthly cable modem rental fees.