Dell MS5320W User Manual page 13

NOTE: If Mouse MS5320W is not listed, ensure that the pairing mode is enabled
on the mouse.
The third-Bluetooth connection light turns solid white for 3 seconds to confirm the
connection is established then dims off. After the mouse and a device are paired,
they connect automatically when Bluetooth is enabled and they are within the
Bluetooth range.
Pairing your wireless mouse
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