56K MODEM Supports V.90, K56Flex, V.92 V.42MNP2-4 and MNP10 error correction function V.42bis and MNP5 data compression Fax modem send receive rates up to 14400bps DTE interfaces with speed up to 115.2Kbps Compatible Hayes AT commands sets Plug and Play for easy installation Microphone and speaker / OS for full duplex speakerphone functionality (only 5636 Modem) Including Data/Fax/Voice Communication software suit Compliant to PCI 2.1 Supports windows98/ME/2000/NT4/XP