Unwanted button push

@herbz47 wrote:

With the Sandisk clipped to my belt I often find that bending or other body movement will cause the music to change stations or a mp3 to reatart.  Is the a Lock switch that will prevent unwanted changes?  Does any one make a Hard case that will neatly fit the player and prevent a buttons from being pushe unintentionaly?

Press and hold Back Button for 2 seconds to enable Key lock, press and hold back button 2 seconds to disable.