Features:
<br />100% Brand New!
<br />It made of oscillator, 
<br />the electromagnetic coils, magnets, 
<br />diaphragm and housing and other components. 
<br />After powered on, 
<br />the audio signal generated by the oscillator current 
<br />through the solenoid coil, 
<br />the electromagnetic coil generates a magnetic field. 
<br />Entangled in the diaphragm and the magnet solenoid
<br />Specifications:
<br />Voltage: 3.5-5.5V
<br />Current:  25mA
<br />Frequency: 2300±500Hz(around)
<br />Diameter: 12mm
<br />Thickness 9.5mm
<br />Color: Black<p> <b><b><img src="https://contestimg.wish.com/api/webimage/56cbf6a812eb835b705f5fd1-large.jpg></b></b></p>