Dell MS7421W Owner's Manual page 6

NOTE: You can connect a device to your wireless mouse using the Dell Universal
pairing.
5.
Install the Dell Universal USB dongle to the USB port on your computer.
NOTE: The RF device is pre-paired in the factory.
Laptop
6.
The connection-mode light (
pairing, and then turns off.
7.
The mouse is paired with your USB device.
If your mouse is not working, see the
Desktop
) on the mouse turns on to indicate the Dell Universal
Troubleshooting section.
6