Which means it cannot seamlessly switch between multiple devices by disconnecting and connecting or by moving the dongle or USB cable. A pain, but manageable. However, it does mean if one of the devices is your work issued laptop then be prepared to find out that you cannot remove a bluetooth device or force the laptop to re-pair without admin …
https://www.amazon.com/ThinkPad-Compact-Bluetooth-Keyboard-TrackPoint/dp/B00C32FWJC