This is BitTradeOne's binaural microphone "Mimi" (Beautiful Ear). It can be used for recording ASMR and audio works. I used it for about an hour for a review, and have stored it since then. There are no noticeable scratches or stains. Overall, the sound quality is as expected for the price, but the sound of ear cleaning is quite good, and the cost performance is quite high. Price is negotiable as the market price is unknown.