Description
The SM40NU-4 Secure 4-Port KM Switcher provides controlled keyboard and mouse access to four independent systems while maintaining hardware-enforced separation. It is designed to allow a single set of USB keyboard and mouse peripherals and shared audio output to be used across multiple computers. Security certification and dedicated smart card support make the unit suitable for sensitive environments.
The switcher is NIAP Common Criteria PP4.0 certified, offering proven peripheral isolation and tamper-resistant behavior. It includes a dedicated CAC smart card port and a 3.5 mm audio jack with the ability to freeze channel audio or CAC sessions while switching. Seamless cursor switching enables users to move the mouse across displays to change active systems without hotkey sequences.
Technically, the SM40NU-4 supports four sources and USB Type A/B keyboard and mouse connections alongside USB Type A host ports. The audio interface uses a 3.5 mm jack and power is supplied by an external 12VDC 1.5A adapter. Operating and storage ranges, product lifecycle, and certifications are documented to meet procurement and deployment requirements.
Connectivity covers USB keyboard and mouse interfaces, an external USB port, a dedicated CAC reader port, and audio output that can be frozen per channel during switching. The device supports Windows, Linux, and Mac hosts and offers multi-monitor control up to four displays per computer when vendor drivers are installed on Windows. Compatibility with standard USB HID devices and line-level audio ensures broad interoperability.
Typical use cases include government workstations requiring secure peripheral isolation, defense command centers managing multiple classified and unclassified systems, and organizational operation centers that need central peripheral control without compromising separation. The secure CAC passthrough and audio freeze features address common operational security requirements. Cursor-based switching reduces training and speeds operator workflows in multi-system environments.
Installation is straightforward – rack or shelf mount placement with an external power brick, standard USB and audio cabling, and driver installation when multi-monitor extended modes are needed on Windows. The enclosure and components are built to industry standards and backed by a two year warranty and a defined 10 year product life-cycle. Documentation and compliance certifications simplify integration into regulated IT environments.
Free Ground Shipping
We offer free ground shipping on every purchase of $300 and more for US and US territory. Please choose "Free Ground Shipping (UPS/USPS)" option at checkout.
UPS Ground
UPS provides up-to-date tracking information. Ground service takes anywhere from 2-7 working days for delivery depending on destinations. UPS Ground does not deliver on Saturdays, Sundays or Holidays.
USPS Priority Mail/USPS Express Mail
For all shipments shipped via USPS, we offer 'DELIVERY CONFIRMATION' number with each package. Difference between tracking number provided by UPS vs USPS Delivery Confirmation number is: Delivery Confirmation status is updated when the delivery has been made or when the package has made it through major USPS stations.
Air Shipment
Air shipments, Overnight, 2nd day and 3 day select methods offer guaranteed delivery time for your shipment. If you are in hurry or in need for the items on schedule, select one of these methods. Up-to-date tracking information is provided with each Air Shipment. AVProSupply has the right to choose between Air shipments to meet or reduce delivery time. For guaranteed delivery of multiple items with expedited shipping, please contact our customer service representative for personalized assistance to get your items delivered to you when you need them.
International Customers
We offer shipping via USPS/UPS for our international customers. You can find different shipping options during checkout.
Most items ordered from AVProSupply will be shipped out from our California Warehouse. Will-Calls are only allowed with Appointment Only - Please call Customer Service to set one up between the hours of 9am to 6pm PST.
We Offer A 30-Day Money Back Guarantee:
Our main goal is to ensure your complete satisfaction with our service and products. If, for any reason, you are not 100% satisfied with your purchase, you can return it within 30 days of the purchase date for a full refund. Our 30-day money back guarantee applies to all of the products we sell, except for: TVs and monitors 20" and larger, Special Order merchandise, or any item indicated as non-returnable. Shipping is not refundable. Prior to returning your purchase, a Return Merchandise Authorization (RMA) number will be provided to you.
Refunds:
Refunds on returned items will be issued in the same payment form as received from the customer at the time of purchase. Once we receive the product and it passes inspection, we will credit your account. Please allow 3 - 6 business days for a credit to appear on your account.
Exchanges:
If the item was sent back to us for an exchange, please allow 3 - 5 business days for the replacement to be processed.
No Returns/Exchanges on the following:
- TVs and monitors 20" and larger
- Special Order merchandise
- Any item indicated on the website as non-returnable
For more information see our official Return Policy
