Why cannot the Xiaomi Dual-mode Wireless Mouse 2 be connected to a new device after it is connected to other devices?

It requires resetting the Bluetooth.
The methods are as follows:
1. The operation method for SN code/the 6th letter after SN code is G: Please first turn the on/off switch at the bottom of the mouse to the Bluetooth channel, and then press and hold the forward and backward buttons for more than 5 seconds at the same time. The mouse will enter the Bluetooth pairing mode. At this point, the indicator starts flashing rapidly, indicating the state of waiting for the Bluetooth to connect (the waiting time for connection is 3 minutes).
In the Windows operating system, right-click the Bluetooth icon in the toolbar and click [Add a Bluetooth device] to open the [Bluetooth and other devices] panel, or select [] >> [Settings] >> [Devices]. Then click [Add Bluetooth or other device] >> [Bluetooth] >> [Mi DMMS2] to complete the connection. Example SN:12345/ABCDE G 0W800001;
2. The operation method for SN code/the 6th letter after SN code is F: In the shutdown state, simultaneously press and hold the left, middle, and right buttons on the mouse, and turn the on/off switch at the bottom of the mouse to Bluetooth mode. At this time, the LED at the end of the gap between the left and right buttons on the mouse will start flashing and lifting, and it will enter the state of waiting for Bluetooth connection (waiting for connection for 3 minutes). In the Windows operating system, right-click the Bluetooth icon in the toolbar and click [Add a Bluetooth device] to open the [Bluetooth and other devices] panel, or select [] >> [Settings] >> [Devices]. Then click [Add Bluetooth or other device] >> [Bluetooth] >> [Mi DMMS2] to complete the connection. Example SN: 12345/ABCDE F 0W800001.