The KVM-440 Combo KVM Switch can control attaching PS/2 and USB servers from local console; The KVM switch supports cascades of up to 3 levels. Control up to 512 Pcs from a single console. Cascaded units do not require any special configuration. A cascade configuration expands the system. Product Features: Brand: D-Link Type: Ethernet Model Number: KVM-440 E Interfaces: Front Panel Button, Hot-Keys on a PS/2 keyboard, OSD Menu (On Screen Display) LEDs: Red for PC Selected, Green for PC Online/Ready Video: 8 x HDB-15 female Keyboard/Mouse: PS/2 & USB Signal Combined Keyboard: 1 x 6 pin mini-DIN female Mouse: 1 x 6 pin mini-DIN female Video: 1 x HDB-15 female Firmware Upgrade Port: Mini USB Auto-Scan Interval: Adjustable time setting by OSD menu Operating Temperature: 0 to 50 degree Celsius Humidity: 0% – 80% Relative Humidity Certifications: FCC, CE, C-Tick, IC, CSA Dimensions: 17.3 x 6.1 x 1.5 Inch Weight: 1.75 kg Details: On-screen Display Supports daisy chaining with up to 3 cascade levels Support for Windows, Linux, Mac OS 9/ OS X, and Sun Microsystems Operating Systems.