How to Order

KVM Combiner device models addressed in this page:

  • SC21H-3 - Secure 2-Port HDMI Video KVM Combiner
  • SC21H-M - Secure 2-Port HDMI Video KVM Combiner, ISRAELI USERS



HSL’s Secure 2-port KVM Combiner enables viewing and controlling two computers:

  • On the same display
  • Using a single set of keyboard, mouse, USB, and audio peripherals
  • While maintaining the highest isolation between computers and peripherals

HSL’s KVM 2-port KVM Combiner provides an easy, intuitive, and secure way of working with two isolated computers.

Secure by design

HSL KVM Combiner switches are designed to meet with the security requirements demanded by government agencies, military installations, financial institutions, and similar security-sensitive customers.

Securely share peripherals across different security domains

Securely share peripherals between computers that belong to different security classifications levels, while keeping the highest possible data-separation security.

Prevent information leaks

Block threats derived from sharing and switching of vulnerable, untrusted, or unauthorized peripheral devices. Prevent peripheral exploits, information leaks, eavesdropping, signal transmission, computer malware; hardware and firmware tampering; by enforcing multilayered security mechanisms.

View and control multiple computers simultaneously

Present and work with up to two computers at the same time.


2-Port System Diagram



  • Simultaneously interact with two computers displayed on the same screen, using a single set of keyboard, video, mouse, and audio peripherals.
  • Smoothly switch between computers (Virtual Display Technology):

    On a single screen, automatically switch control from one computer to another, by dragging the mouse cursor over the computer’s display border. Peripherals switch to the next computer, without the need to press any buttons, once the mouse passes the display border.

  • Avoid typing mistakes:

    Since two-way communication is blocked by the KVM security, the keyboard lock LEDs do not function. LEDs on the product’s front-facing panel show the status of the keyboard locks (Caps Lock | Num Lock | Scroll Lock). This helps you avoid making typing mistakes.

  • Advanced viewing modes: 
    Supports picture-in-picture (PiP), side-by-side, full screen, and custom view modes for each channel, enabling users to easily set how they interact with both computers.

  • Easy identification of each channel: 
    Users can easily see which computer they’re controlling, when using customized channel-text labels that appear on each channel’s display.

  • Easy to use and intuitive configuration:
    Quickly switch between display modes, using basic keyboard shortcuts.

Part Number SC21H-3
No. of Sources 2
Console Ports
Displays 1 x HDMI 1.4
Max Output Resolution Supporting resolutions up to 1920x1200
Mouse & Keyboard USB Type A
Audio Jack 3.5 mm Jack
Computer ports
Display Type 1 x HDMI 1.4
Max Input Resolution 1920x1200
Mouse and Keyboard USB Type B
Audio Jack 3.5 mm Jack

Power input 100 to 240V AC External, 12V DC, 1.5A

  • Operating Temperature: 32° to 104° F (0° to 40° C)
  • Storage Temperature: -4° to 140° F (-20° to 60° C)
  • Humidity: 0-80% RH, non-condensing
  • Supported OS: Windows, Linux, Mac
Regulatory Compliance
  • CE, RCM, FCC class B, VCCI, TUV US, TUV Canada
Security Accreditations
  • Designed to meet with the security requirements demanded by government agencies, military, financial institutions and similar security sensitive customers.
Physical Characteristics
  • Dimensions: 177 x 82 x 35 mm / 6.9 x 3.2 x 1.3 inches
  • Device weight: 0.52 kg (1.1 lbs)
Warranty, reliability
  • Product life-cycle 10 years
  • Warranty 2 Years
Model Description CPN
SC21H-3 Secure 2-Port HDMI Video KVM Combiner, PP 3.0 CPN10287
SC21H-M Secure 2-Port HDMI Video KVM Combiner, ISRAELI USERS CPN15191


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