Press button to select Max Volume. Press button for adjustment between 0-100. If a certainValue is set, when volume is being adjusted, the sound value can not exceed maximum volumevalue. If current volume is over Max Volume, when lock set menu is set, current volume willbecome set maximum volume, if current volume is below maximum volume, customer set volumewill stay unchanged.Max VolumeInitial VolumeClear LockPress button to select Unlock mode. Press button to unlock all set modes,setting all lock options to off, and the maximum volume returns to 100.The TV will remember it after your setting,that will be the volume when turn on theTV next time.Source LockSource Lock will control the On or Off of hinder external inputmodes.Press button to set as on or off.When the source lock is set as on, TV source will display, atthis time, when press SOURCE button, the TV can switch tocorrespondingsource and will display the Source is locked.Parental LockPress button to select parental lock. Press button to select OFF or 4-18 to limitthe age of children who will watch TV.OKOKMenu