MiniDSP UMIK-1 USB calibration/measurement microphone. Allows you to measure acoustic response of your room and use equalization to achieve a neutral response. Works with Room EQ Wizard (REW)(free software), DIRAC or other room correction software. Mic plugs directly into USB port on your computer (works for iPad and iPhone as well, haven’t tested with android). In excellent working condition. Only cosmetic blemish is to the upc/serial number sticker - caused by the microphone mount saddle rubbing against it (see photos). Bought new from Solen.ca Will ship within Canada: +$25