The Zoom/FaxModem 56K Dualmode models are high-speed V.90 faxmodems with voicemail that have the ability to receive data from compatible sites at speeds up to 56,000 bps, and at higher speeds with compression. 56K V.90 External PC & Mac Modem incorporate both V.90 and K56flex to achieve download speeds nearly twice as fast as any conventional analog modem. That means fast access to the Internet, World Wide Web, and local area networks (LANs) over standard phone lines.