Dell XPS M2010 (MXP061, Mid 2006) - Manual (Page 48)

The computer may go through a series of beeps before the pairing occurs.
4. Test the pairing by touching the touchpad to move the cursor to ensure that pairing was successful.
If pairing was unsuccessful, repeat these steps as necessary to pair your keyboard with your computer.
Pairing the Mouse
The Dell™ XPS™ M2010 Mouse Connection Wizard launches the first time you turn on your computer. Follow the instructions on the wizard to pair your mouse
with your computer.
Mouse Pairing With the Wizard
Follow the instructions on the Wizard:
1. Insert two AA batteries, which are shipped uninstalled, into the mouse and replace the battery cover.
1 wireless connection button on keyboard
1 batteries 2 battery cover
1 back button 2 forward button 3 wireless light
4 scroll wheel 5 left mouse button 6 right mouse button