Retail price: 9900 yen Mono microphone with switchable single/omni-directional polar patterns. Suitable for tabletop use in meetings, interviews, etc. audio-technica Mono Microphone (Boundary) AT9921 I purchased this new previously, but I only tested it once indoors. After that, it was unused and stored in a closet, so I am offering it for sale this time. Please forgive any scratches or warping on the outer box, as well as any dust that may have accumulated during opening and testing. What I am selling includes the microphone itself, the battery box, the instruction manual, and everything else shown in the photos. (There is no warranty or purchase receipt.) Also, the included button battery (LR44) is unused, but the recommended usage period for the battery has expired, so when you actually use it, we recommend that you use the plug-in power function of an IC recorder, etc., or prepare a new button battery. (Using an old battery may cause problems such as insufficient power due to natural discharge or liquid leakage due to deterioration.)