SONY ECM-TL3 telephone recording earphone microphone with high sensitivity and wide frequency characteristics. I bought it a few years ago and opened the box, but I never had a chance to use it, so I've been storing it at home. Because the case is thick, I will take it out of the case and ship it. - Brand: SONY - Model: ECM-TL3 - Type: Telephone recording earphone microphone - Connection method: Plug-in power system - Frequency characteristics: 20Hz - 20kHz - Sensitivity: -55dB - Impedance: 2.2kΩ #Halloween on Mercari