Keyboard Clicks: This parameter is used to set whether  to  generate  beep  sound in  response  to every keyboard touch. Select “ON” to enable the beep sound, and select “OFF” to mute.
Voice  Prompts:  This  parameter  is  used  to  set whether to play voice prompts during the operation of  the  device.  Select  “ON”  to  enable  the  voice prompt, and select “OFF” to mute.
Volume (%): This parameter is used to adjust the volume of voice prompts.
Lock Power Key: This parameter is used to set whether to lock the power key. Select “ON” to disable the power key. If you select “OFF”, and press the power key, the device will be shut down in three seconds.