Any charger with higher voltage output is NOT allowed and may affect the product performance. Important Note: Please use Standard 5V Adapter( Not Included ) for powering. Package includes: usb 3.0 switcher*1pc, 1.5m USB 3.0 Cable*2pcs, 1m USB 2.0 Micro USB Cable(5V 2A) for extra power.Button and LED indicate lights, you can easily switch between 2 computers by a single click on the button with LED indicating the active computer.Plug and Play, driver-free for Windows 10/8/8.1/7/Vista/XP and Mac OS X, Linux, and Chrome OS External Power is unnecessary.Fast data transfer up to 5 GB/s and backward compatibility USB 2.0 and 1.1 specifications.Ideal for sharing devices such as printer, scanner, mouse, keyboard, card reader, flash drive and other USB deivce between 2 computers If the switcher doesn't work on external hard disk, please connect the device with Micro USB Cable for extra power.This USB 3.0 Switcher Selector allows one button swapping between 2 computers to share 4 USB peripheral devices without constantly swapping cables or set up complicated network sharing software.I would therefore have a closer look at your dock and see what connectors it has and if possible consider using a HDMI adapter and KVM. Note: You can also use a DVI to HDMI converter to allow the Samsung to accept DVI.

Or use a Displayport to HDMI adapter and then use HDMI on both. If so it might be possible to use a Displayport to DVI adapter and then use DVI on both the Mac and PC. Most of these have VGA and at least one other video interface - possibly a Displayport connector. You say you are using a Dell docking adapter. Ideally you would use either DVI or HDMI connections but of course in your case your constrained by what your old PC laptop has available. Yes you can get a Mini Displayport to VGA adapter and you would need one to do VGA at all, but there are lots of reports of issues whereby it might not initially 'detect' the VGA monitor signal and require either multiple efforts at disconnecting and reconnecting the cable/adapter or even rebooting. those using a Mini Displayport interface. VGA is a very old standard and is not really well supported on modern Macs i.e. You would want one in this case that switched VGA video and USB for the keyboard and mouse. I have used a KVM between a Mac and a PC in the past and in theory there should be no specific issues relating to that.

Best kvm switch mac and pc