Piezo Electric Crystal Earphone Sensitive High Impedance Ceramic Ear Piece for Transistor Radio DIY Electronics Projects<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Perfect to make electronics projects like Crystal or Transistor Radios </span></li><li><span class="a-list-item"> High 20，000 ohm impedance with resistance over 20 million ohms and a capacitance of 15，000 pf </span></li><li><span class="a-list-item"> Rated Sensitivity of 57db at 1KHz in the frequency range from 200 to 8，000Hz </span></li><li><span class="a-list-item"> Classic style highly sensitive molded earpiece with 42-in twisted wire with pre-tinned bare wire connections </span></li><li><span class="a-list-item"> Classic PiezoElectric Crystal Earpiece for DIY Electronics Kits </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41QWew31PyL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51PX6gf4oTL.jpg" noproxy>