If you are listening to music on your device for a long period of time, you can save power by turning the screen off. This can be done by assigning a button to toggle the screen on and off in Windows Media Player. Follow these steps:
 

1. Open Media Player to the main screen and go to Menu >Options >Buttons.
2. Scroll down to the bottom of the list and select (highlight) the Toggle Screen option.
3. Tap on the Assign button (non-touch screen smartphones: Select Menu >Assign).
4. Press the button that you want to assign to the toggle screen function.
5. Press OK when you are finished assigning Media Player functions to buttons.

1. Open Media Player to the main screen and go to Tools >Settings >Buttons.
2. Select a Media Player function from the Select Function drop-down menu by tapping on it.
3. Press the button you want to assign to the function.
4. Tap OK.

Note: Media Player 10 Mobile allows you to assign its functions to the directional/navigation pad, but not the application launch buttons. (Media Player 9 for Pocket PC does allow you to do this.) Also, if your Windows Mobile 5 or 6 device has a QWERTY or numeric keypad, you can assign Media Player functions to those keys. Finally, if you assign a function to a button that already has another Media Player function assigned to it, it will lose its original assignment.