From BioStar 2.5.0, you can configure an alert message about the device disconnection detected. When a device is disconnected, the alert message will be shown as a pop-up message.
Go to Setting > ALERT.
Check the box named Device Disconnection Detected and then click Apply button.
At this stage, if you want to describe an alert message, you can click note shaped icon and enter Name and Message.
When a device is disconnected, the alert message will be displayed like below.