3M ™ Mobile Projector MP225a© 2011 3M. All Rights Reserved. 23EnglishAdjusting the VolumePress the Volume Up or Volume Down button to adjust the sound. A volume bar willappear on the screen to help you set the volume level.Muting the VolumePress the MUTE button to mute the volume. An icon will appear on the screen toindicate the current setting. To restore the volume, press the MUTE button again.If you press the Volume Up or Volume Down button while the volume is muted, thevolume will also be restored, but from an initial volume level of zero.Checking the Battery LevelTo check the battery, press the Battery Status button. A battery bar will appear onthe screen indicating the amount of charge currently in the battery.