K304E Secure KM Switch: 4-Port

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System Diagram

**This product has reached End-Of-Life status. See link to Its successor product: SECURE 4 PORT KM SWITCHES**

The K304E is a secure 4-port KM Switch with a special secured USB port for smartcard/biometric reader.

The K304E allows sharing a single set of keyboard, mouse & audio between four computers that belong to different security classifications while isolating all hosts from each other and from the peripherals that are being shared through it, keeping the data of each computer completely separate.

With the K304E a user can continuously view four single, dual, triple, or quad head computers and seamlessly switch keyboard, mouse and audio to either one of the sources by moving the mouse cursor across screen boarders.

The K304E is designed to provide the highest possible computer & peripheral isolation as demanded by government agencies, military, financial institutions and similar security sensitive customers. It is built to comply with EAL4+ security requirements and with the latest requirements of the National Information Assurance Partnership (NIAP) Protection Profile PSS Ver 3.0 for peripheral sharing switch devices.

Best suites users in challenging work environments who are required to interact with multiple computers and observe multiple monitors simultaneously.

How does it work?

  • Connect up to four computers and a single set of keyboard, mouse & audio to the KM.
  • Connect display(s) directly to each computer. Support multi-monitor PCs with up to 4 displays per PC in duplicate or extended modes.
  • Connect a smartcard/biometric reader to the KM's DPP secure port to support user authentication across multiple isolated computers. 
  • Computers and peripherals are fully isolated from each other.
  • User can interact with all four computers at the same time using a single set of keyboard and mouse.
  • Seamlessly switch between the selected sources by moving the mouse cursor across screen boarders.
  • Audio is switched automatically once control is switched to another source.

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  • Continuously view and control four computers using a single set of keyboard, mouse and audio peripherals.
  • Virtual Display Technology (VDT):
    Seamless keyboard, mouse and audio switching between computers once mouse cursor crosses display borders.
  • Control multi-monitor PCs:
    Support multi-monitor PCs with up to 4 displays per PC in duplicate or extended modes. Multi-monitor support requires driver installation, currently available only for Windows.
  • Predefined presets for versatile display configurations:
    Presets reflect the layout and boarders of computer displays to the KM and allow it to correctly associate the mouse with each computer based on its respective display(s).
  • Work freely without compromising security:
    Display and control classified and non-classified computers without compromising security.
  • Protect against leakage and malicious attacks through USB, keyboard, mouse and audio peripherals: 
    Prevent vulnerable peripherals from mediating between computers by ensuring that audio and USB data flows in a single direction.
  • Protect against unauthorized peripheral device threats:
    Threats imposed by peripheral devices that should not be connected to a specific peripheral sharing switch port (e.g., a USB mass storage device mistakenly connected to the keyboard port).
  • Protect against authorized but untrusted peripheral device threats:
    Threats imposed by legitimate and authorized peripheral devices (such as a standard USB keyboard) that may be vulnerable to malicious attacks and cause data leakage when switched between sources.
  • Cost effictive solution: 
    Save valuable desk space by using one set of keyboard, mouse & audio to easily navigate and control multiple computers.
  • Biometric/Smart-Card reader support: 
    Connect a smartcard/biometric reader to the KM's DPP secure port to support user authentication across multiple isolated computers.
  • Highest security by design: 
    Common Criteria EAL 4+ approved, compatible with NIAP security requirements.


Keyboard & Mouse Threats Protection


Monitor / Display Threats Protection



Audio Threats Protection



Hardware & Firmware Tampering Protection



USB Threats Protection



K304E Secure KM Switch: 4-Port  

No. of Computers


Console Mouse and Keyboard Ports

2 * USB Type A, 2 * PS\2

Console DPP Port

USB Type A

Console Audio Jack

3.5mm Female

Computer/Keyboard Mouse Port (per Computer)

USB Type B

DPP Port (per Computer)

USB Type A

Computer Audio Jack (per Computer)

3.5mm Female


320 (W) x 130 (D) x 52 (H) mm / 12.8 (W) x 5.2 (D) x 2 (H) inches


2.08 Kg. (1.32 lbs.)

Power Requirements

12V DC, 1.5A (max) power adapter with center-pin-positive polarity

AC Input:

100 to 240VAC

Power Type


Operating Temperature

32° to 104° F (0° to 40° C)

Storage Temperature

-4° to 140° F (-20° to 60° C)


0-80% RH, non-condensing

Security Accreditation

Common Criteria EAL 4+ ALC_FLR.3

Product life-cycle

10 years


2 Years

K304E - 4 Port High Security KM Switch, USB PS/2 keyboard and mouse, USB user authentication port, Audio out,  Active anti-tampering, Front panel push buttons, RDC Port, Field programmable              



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