Price history on Walmart.com for
Unique Bargains 23pcs 9.7mm x 7mm SMD MIC Electret Condenser Microphone Pickup Unit
See on WalmartProduct info
Feature:SMD SMT PCB Surface mount cylinder shaped it is a converted the voice signal to electrical signals energy conversion device.It is back electret type with high resistance to vabrations high signal to noise ratio.Widely used in the cassette recorder microphone and voice control circuits.
... read more.