Description:

• Work Voltage: 3.3-5V
• With fixed bolt hole for easy installation
• PCB Dimension: 3.3 x 1.3cm
• DuPont line length: 21cm
• Module adopts 9012 transistor drive
• 
  

Feature:

No oscillation source, need square wave (frequency 2K-5K ) to drive.

Sound frequency control, you can make a "do re mi fa sol la si" effect.

Pin Definitions:

• VCC : 3.3V-5V
• GND : The Ground
• I/O : I/O Interface of SCM