1,3 - "< / >" - forward/backward, volume control
2 - "R/V" - record/volume control switch button
4 - Strap holder
5 - Earphone jack
6 - Display
7 - “>"> / ||" - play/pause
8 - USB connector cover
9 - "HOLD" - lock switch
10 - "MIC" - microphone
11 - "M" - menu button/menu navigation
12 - Battery cover