Full Details from Amazon.com : http://www.amazon.com/gp/product/B0029U15GC?tag=onigi-20
IOGEAR 4-Port Dual View Dual-Link DVI KVMP Switch with Audio GCS1644 (Black)
Dual View Dual-Link DVI support - share 2 DVI monitors with a single keyboard and mouse along 4 computers high resolution - up to 2560 x 1600
2-port USB 20 hub for peripherals sharing Asynchronous hotkey switching between KVM focus USB peripheral and Audio ports
IOGears Display Emulation Technology reads and remembers the monitors parameters EDID so there is no delay or change of video resolution when switching between or booting computers
Complete keyboard and mouse emulation for error free booting and real-time switching computer switching via front panel push buttons or hotkeys supports MAC and Sun keyboard and special keys
Supports MAC and Sun keyboard and special keys firmware upgradeable Plug Play - no software installation required Buzzer ONOFF via hotkey Multi OS platform support All cables included