Thank you for viewing. This is an electret condenser microphone ECM-K10D. It's quite old, but I'm selling it because I don't use it. The solar battery's light flashes, but I don't know how to use it, so I would appreciate it if you could understand this before purchasing. Product Features: High-sensitivity, highly directional conference microphone that clearly captures sound from the intended direction. The price was 10,000 yen at the time, making it an expensive item. #SoundCollection