From: scientist77017@gmail.com   
      
   I got this, but saw no polarity markings like my other larger piezo buzzer.   
      
   Andy   
      
   Piezo Transducer   
   Electrical Specifications:   
      
       Rated Voltage: 5Vp-p   
       Rated Current: 2mA (max)   
       Sound Output at 10cm: 85 dBA   
       Resonant Frequency: 2.04kHz   
       Dimensions: 8.43mm H x 12.1mm diameter   
       Number of pins: 2   
       Pitch: 6.5mm   
       Lead thickness: 0.62mm   
       PC mount   
       Markings: 12RT04CC   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)