How are the usb devices emulated for the computer not currently in use? are they essentially disconnected from the computer when not being used?

Correct. The not in use computer essentially thinks the devices are disconnected. There can be a bit of a delay for devices to be recognized when you switch. Same as if you were plugging them in fresh. Works great by the way. I use this to switch a wireless keyboard and mouse between two devices. I've also used thumb drives and usb headphones and it worked great. Personally very happy with it.

Can anyone verify if this switch does or does not have a port for an external power supply?

It has a port for adding supplemental microUSB power. It does not come with a cable or wall plug.

Edit rig and gaming rig on the same desk, razer chroma keyboard and mouse....is there any lag issues with the keyboards or mouse in gaming?

I have been able to play CS:GO and other games with no noticeable input lag. I use a Corsair K70 and Logitech G502 so I would assume that the Razer keyboard and mouse will function just fine.

Can this be used for sharing one display monitor by two Mac laptops?

Hi Dear friend, Thank you very much for your inquiry. This switch is mainly used for share usb device between 2 computers. And if you have any interest in KVM switch, you can searc for ASIN B01D5XVO62 as a reference. If you have any other questions or problems, please feel free to contact us. We will try our best to help you in 24 hours. Thanks for your all support and trust on UGREEN. UGREEN GROUP LIMITED

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Description

🔌 Switch smarter, work faster—your USB hub just got an upgrade!

ONE CLICK CONTROL - Switch devices instantly with a tactile button and LED status indicator—control at your fingertips.
DUAL PC POWER PLAY - Effortlessly toggle 4 USB devices between two computers—boost your multitasking game.
PLUG PLAY FREEDOM - Driver-free compatibility across Windows, macOS, Chrome OS, and Linux—just connect and go.
BLAZING FAST TRANSFERS - Experience up to 5Gbps speeds with USB 3.0 ports—no more waiting on file moves.
STABLE HIGH POWER SUPPORT - Extra 5V/2A power port ensures smooth operation for demanding peripherals like HDDs and cameras.

The UGREEN USB 3.0 Switch Selector lets two computers share up to four USB devices with a single button switch. Supporting ultra-fast 5Gbps data transfer and broad OS compatibility, it’s designed for seamless multitasking between work and personal setups. With an optional power supply port for high-demand devices and a compact, driver-free design, it’s the ultimate productivity booster for professionals juggling multiple machines.

Specifications

Operation Mode	ON-OFF-ON
Current Rating	2E+3 Milliamps
Operating Voltage	5 Volts
Contact Type	Normally Open
Connector Type	Usb
Brand	UGREEN
Terminal	Physical
Item dimensions L x W x H	4.09 x 2.01 x 0.59 inches
Circuit Type	2-way
Actuator Type	Push Button
Contact Material	Metal
International Protection Rating	IP55
Number of Positions	4
Upper Temperature Rating	8E+1 Degrees Celsius
Control Method	Touch
Connectivity Protocol	Usb
Color	Black
Wattage	10 watts
Unit Count	1.0 Count
Number of Items	1
Global Trade Identification Number	06957303837687
Manufacturer	Ugreen Group Limited
Item model number	30768
Item Weight	5.3 ounces
Product Dimensions	4.09 x 2.01 x 0.59 inches
Item Dimensions LxWxH	4.09 x 2.01 x 0.59 inches
Computer Memory Type	72-Pin EDO SIMM Memory
Voltage	5 Volts
ASIN	B01N6GD9JO
Is Discontinued By Manufacturer	No
Date First Available	March 31, 2017

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