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TRENDnet > 
Item#: N82E16817403058

TRENDnet TK-409K 4-Port USB KVM Switch Kit with Audio (Version v1.3R)

  • 4 Ports Computer Connections
  • 1 Port Monitor Connections
  • AutoScan Interval 10 ~ 60 seconds
  • Video Resolution 2048 x 1536
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  • newegg Unified Control Share one monitor, keyboard and mouse between four computers using the TRENDnet TK-409K. The built-in VGA connector supports monitors with resolutions of up to 2048 x 1536.
  • newegg Easy Switch between PCs Easily switch from a computer to another by using the keyboard hotkeys, hardware push button or switching software (for windows).
  • newegg AutoScan With the Autoscan function, the TRENDnet TK-409K KVM switch automatically switches among four computers for operation-free computer monitoring.

Learn more about the TRENDnet TK-409K




D-Sub, USB
PC Connectors
4 x VGA / SVGA HDB 15-pin
4 x 3.5 mm speaker jack
4 x 3.5 mm microphone jack
Console Connectors
1 x USB Keyboard (type A)
1 x USB Mouse (type A)
1 x VGA / SVGA HDB 15-pin
1 x 3.5 mm speaker jack
1 x 3.5 mm microphone jack
Computer Connections
4 Ports
Monitor Connections
1 Port
Video Resolution
2048 x 1536
PC Selection
Push Button, Hot-Key Commands or Windows-Based Client Switching Software
AutoScan Interval
10 ~ 60 seconds
0ºC to 40ºC(32ºF to 104ºF)
0% to 90%,Non-Condensing
6.6" x 3.2" x 1.1"
6.5 oz.


Audio Features
with Audio
Power Features
USB interface power
Control up to 4 computers / servers with one set of console device

USB keyboard / mouse emulation with 4 sets of detachable KVM cables

Compliant with Windows, Linux, and Mac OS

High video quality, up to 2048 x 1536 VGA resolution

Listen to music from one computer while working on the other

Auto-Scan & LED display for computer monitoring

Computer selection by face panel push buttons, keyboard hot key commands or Windows-based client switching software

User definable hot key (Windows only)

Plug & Play and hot-pluggable

USB interface power method


Package Contents
Quick Installation Guide
4 sets of USB KVM cables (2 x 1.2 m / 4 ft., 2 x 1.8 m / 6 ft.)
4 sets of audio cables (2 x 1.2 m / 4 ft., 2 x 1.8 m / 6 ft.)

Manufacturer Warranty

2 years limited
2 years limited

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the TRENDnet TK-409K

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  • Rich H.
  • 9/14/2014 3:20:51 PM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

1 out of 5 eggsHorrible KVM!

Pros: Pros? You can select specific inputs rather than a single button to cycle through inputs until you get to the desired input.

Cons: Plenty! It would only sporadically work on a PC running Server 2003 and generally not have issues with two different Win7 PC's until today. Today when switching back to one of the Win7 PC's the red indicator light just kept flashing instead of staying solid after a couple seconds. This is what it would frequently do when switching to the Server 2003 machine and then the mouse and keyboard would not function. I ended up powering all three pc's off (using the power button since mouse and keyboard would not work now on ANY of the PC's). I switched to input 2 on the KVM and powered on that PC. The red indicator light just kept flashing. When the PC fully booted the light was still flashing and then I received an error saying the USB device connected to the PC had failed. I connected the mouse and keyboard directly to the pc, bypassing the KVM switch, but leaving the monitor plugged in to the KVM and they still won't work. I finally ended up eliminating the KVM completely, going with a direct connect for the mouse, keyboard, and monitor and after powering down the PC using the power switch that PC is back up and running. Save yourself plenty of headaches and go with the iogear unit. I'm using one of those purchased from Newegg and have not had any problems with it. You can't select a specific port with it though. You have to cycle through them until you get to the input you want...but it works!

Manufacturer Response:

Hello Cayman Diver,

We are sorry to hear that you are having issues with the TK-409K. This KVM uses a pass-through architecture, not a hardware emulator. When it switches it is physically disconnecting the hardware connected to the console ports from the active computer to the new computer. When this occurs your computers need to redetect and reload the console hardware. Switching too fast or something interrupting this process can cause the OS to load the hardware as an unknown device.

Typically you can power cycle the KVM to recover it. You will have to disconnect all the KVM cables from the KVM simultaneously for it to lose power as it is bus powered. After you reconnect the cables the computer should reload the hardware.

If you are using any third party hardware between the KVM and the console hardware or the computers you may want to remove them to see if they are causing the issues as well. For example, interface converters, docking stations or extension cables.


TRENDnet Support

Did you find this review helpful? Yes No

  • Andrew L.
  • 1/25/2014 6:15:34 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsCan't swtich from Mac to PC

Pros: Sale price was good.

Cons: I'm trying to use this to switch between a Windows 8.1 PC and a Mac mini, but while this KVM can switch from the PC to the Mac, when I try to switch back, the PC can't see the KVM or anything attached to it. I found that someone submitted a review for this device at a large online bookstore with the same problem.

I submitted a support ticket to Trendnet. After five days, I finally received a canned response which said to make sure I use their cables, use the latest drivers, etc., and ignored the actual problem.

Manufacturer Response:

Hi Anonymous,

I can understand your frustration for this unit not working as promised and for that I deeply apologize. Please email me directly at with "Newegg TK-409K Review" in the subject line and I will be able to respond immediately to help you get setup and running smoothly. Thank you for taking the time to review our product. We hope to hear from you soon to regain your trust in TRENDnet.

Warm Regards,
TRENDnet Sales Support Team

1 out of 1 people found this review helpful. Did you? Yes No

  • larry u.
  • 12/26/2013 1:15:35 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

1 out of 5 eggsHas a problem with HP Laptops

Pros: Cheap.

Cons: With the VGA cable plugged in from my laptop's VGA out to the switch and the port number on the switch selected to my laptop's input, I get no display... i.e. no external display detected. However, when I select an input other than my laptop's on the switch, my laptop detects external display and switches off! So I can not have my laptop connected at all!

Manufacturer Response:

Hi Valued Customer,

We apologize for your overall frustration for this KVM switch kit not working as promised. If not mistaken, you have a laptop along with other PCs connecting to this KVM and sharing a same set of keyboard, VGA and mouse. I am curious if you have used the proprietary VGA cable from TRENDnet, and also if a different port works for your laptop or not. Please email me at with "Newegg TK-409K Review" in the subject line and I will be able to assist you immediately.

Warm Regards,


2 out of 3 people found this review helpful. Did you? Yes No

  • Mr. H.
  • 4/25/2013 7:32:59 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsUpdate

Pros: Almost works. Switches sound.

Cons: I have been in contact with Trendnet and they have NOT found a solution.

Their last email to me said that this device does not support EDID emulation, despite saying that it did earlier.

Then they said that I should switch whatever system I am starting to use the Monitor and the resolution issue will not happen. I use Wake On LAN remotely and cannot always switch resolutions - so this is NOT a solution.

Their engineering staff is just deciding not to fix the issue.

Manufacturer Response:

Dear customer,

Please accept our deepest apologies for any inconvenience this has caused you. Please contact us at with "Newegg TK-409 Product Review" in the subject line and someone will assist you immediately to resolve your issue. We look forward to hearing from you directly and restoring your faith in TRENDnet products.


TRENDnet Sales Team

0 out of 2 people found this review helpful. Did you? Yes No

  • Mr. H.
  • 4/13/2013 3:20:50 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsNot really OK...

Pros: Works, switches speakers and mic also. Cables are included.

Cons: Does not appear to support EDID - so when a Windows 7 machine that is not currently displaying on the monitor boots up it always defaults to 1024 x 768.

The wires coming out all sides limits the places where this can be placed and the cables are a bit on the short side.

Manufacturer Response:

Dear Candide,

Please accept our deepest apologies for this inconvenience. Our engineers are looking into it now and will contact you soon for a possible resolution. Please e-mail us at , reference “New Egg Product Review” and someone will contact you immediately to get you up and running.

Warmest regards,

TRENDnet Sales Team

0 out of 1 people found this review helpful. Did you? Yes No

  • Brian D.
  • 12/11/2012 12:15:17 PM
  • Tech Level: Average
  • Ownership: more than 1 year
  • Verified Owner

3 out of 5 eggsGood. Does what it needs to do.

Pros: Allows me to share monitor, keyboard, mouse, and audio.

Cons: Buttons are not always responsive. I have to play with it a little to get to the right machine.

Manufacturer Response:

Valued customer,

We are sorry for any inconvenience this may have caused you. Please e-mail us at, reference "New Egg product review", and someone will contact you in an expedited manner. We look forward to working with you directly and restoring your faith in TRENDnet products.

Warmest Regards,

TRENDnet Sales Team

1 out of 2 people found this review helpful. Did you? Yes No

  • Mark H.
  • 11/14/2011 4:48:59 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month

5 out of 5 eggsGood, inexpensive switcher

Pros: For years, I had two computers on my desk, but only one monitor/keyboard/mouse. It wasn't because work wouldn't provide one, it was just that having multiple keyboard/monitors was giving me a headache. With a third computer arriving at my desk, I needed to replace my current KVM, and unfortunately, good quality DVI-based KVMs are out of most people's price ranges.

This switch exceeded my expectations. The software, despite being several years old, works fine under Windows 7-64 bit as well as Windows XP, and allows you to have an icon at the bottom identifying the PC number, switch to another PC from the task bar, lock the audio to a particular PC, and activate auto-scan between PCs. Having selector buttons and audio on the KVM itself makes this product a winner.

Cons: Cable sticking out the side, and two different lengths of the cable from the KVM to the computer. Software supplied by TrendNet only works with Windows systems, and the software does not allow you to change the name from "PC 1" to more friendly "Win 7"/"XP"/"Linux". No DVI-to-VGA adapters supplied.

Other Thoughts: Allow 1-3 minutes for each computer to recognize the KVM when first installed. After connecting the computers, be sure to run the auto-adjust on your monitor to remove the "out-of-focus" text on the screen. Hotkey sequence to switch between computers is hitting ScrollLock twice within 2 seconds. Once software is installed, you can use CTRL-ALT-Number to switch between PCs.

About Virtualized environments: In addition to my regular Windows environment, I run Virtualbox with several virtual machines. If you have the virtual window selected, then the hotkeys will not work. If the "focus" is on the non-virtual environment, then the hotkeys work fine.

Suggestions to manufacturer: Test and update software for Windows 7 (both 32-bit and 64-bit) as well as upcoming Windows 8. Provide APIs so that a good Linux programmer can write the code for Ubuntu/OpenSUSE/etc .

1 out of 2 people found this review helpful. Did you? Yes No

  • Matthew H.
  • 10/24/2011 11:54:33 AM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsGreat for the Money

Pros: I really like this KVM switch. For the most part it works great. Sometimes it freaks out and won't let anything connect to it and you need to unplug all 4 main plugs to get it to power cycle and work again, but that is not very often. I never remember KVM keyboard shortcuts so I really like the buttons on this one. And the cool blue color looks nice on my desk.

Cons: I wish the wires were all on one side so it didn't have to spiderweb all over the place.

Other Thoughts: For the money it has good stability and good features. I'm sure there are better products for a lot more money but this was in my budget and does a good job.

1 out of 1 people found this review helpful. Did you? Yes No

  • Brian P.
  • 5/7/2011 10:32:22 AM
  • Tech Level: Somewhat High
  • Ownership: 1 week to 1 month

1 out of 5 eggsTrendnet TK-409

Pros: Inexpensive, easy to set up. I use a Logitech wireless M570 Trackball and a Microsoft wireless keyboard which took some time initially to install drivers but once installed both work fine. Three of the computers are PS/2 but still the USB works fine. One box has no PS/2 which is why I selected this switch.

Cons: As mentioned in other reviews, cords coming out from sides and slow transition between computers. But neither are dealbreakers.

My issue is that I have four boxes connected and on three of them the screen flashes between black (no video signal) and the expected picture. One flashes every so often and the computer is usable. For the other two, the screen is primarily black and the picture flashes intermittently making it difficult to impossible to use those computers.
The WIN 7 OS box is the worst, The box with XP OS is second worst, the Vista Enterprise works flawlessly and the Vista Business works mostly.

I contacted Trendnet via e-mail and the response was to "check screen resolution and refresh rates". I am using a Samsung 2770 and the default refresh setting is 60hz with no options. Screen resolution is optimal at 1920x1080 which all four boxes support.

I e-mailed Trendnet back with my results, but have received no response. Their support, as mentioned elsewhere, is

Other Thoughts: On balance, I would really like this KVM, except that it doesn't work for two of my four computers and tech support is unsatisfactory.

1 out of 1 people found this review helpful. Did you? Yes No

  • Matthew H.
  • 4/25/2011 12:38:27 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

4 out of 5 eggsPretty Good, Decent For Price

Pros: PRICE! compared to other 4 port USB KVM switches with audio and buttons, the features/price ratio is pretty good.

Cons: It doesn't do USB emulation, so when you switch, the "from" computer sees everything get unplugged, and the "to" computer see's everything plugged in. if you have speakers on each machine then it's a lot of usb DING sounds and about a 5-10 second wait for it to come available, this is normal for cheap USB KVM switches. If you are using only the speakers through the KVM switch then you don't hear the disconnection sounds, only the connecting sounds. Also the switch flipped out on me once and it sort of worked but was very degraded until I power cycled it by unplugging all plugs. I keep forgetting the hotkey so i just use the buttons on the unit. And another con would be that cables come out from every direction on this thing, making it tough for desktop placement. I am trying to figure out a way to wall mount it, or mount it on the side wall of my desk.

Other Thoughts: Like i said the price to features is good, the actual performance left me happy. I have a long history with trendnet products and like pretty much everything they make. Mostly.

1 out of 1 people found this review helpful. Did you? Yes No

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Item#: N82E16817403058
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