Elecom M-XGS30BB User Manual page 14

4) Press the button to switch between the connected devices.
Please refer to
The selected connected Bluetooth device will be registered under your connected devices.
5) Click "Bluetooth".
6) When the add device screen is displayed, hold down the pairing button on the underside
for 3 seconds and then release.
Pairing mode will be activated and the LED will blink.
The LED will blink white when the connected device is "PC1" and green when it is "PC2".
"Switch connected device" to switch between connected devices.