特点
Profile as low as only 2.3mm.
 Sharp index feedback is ensured by
    the metal contact structure employed.
 Externally measures 10.0mm x
    10.0mm x2.3mm.
 Reflow-solderable.
 4 way and center push operation
    are possible.

 应用范围
   Mobile telephones,VCR cameras,
     stereo headphones,car radios,
     PDA,Notebook PC.