This is an AUDYSSEY microphone from DENON for sound field measurement. Model: DM-A409 The main unit is no longer in my possession, so please understand that I cannot confirm its operation. This is a used item, sold as-is. There are no noticeable scratches or stains. No instruction manual or box. It may appear clean or dirty depending on the lighting. *Please refrain from purchasing if you are concerned about minor details. Please purchase only if you understand that this is a used item and will be sold as-is. Please be aware that we cannot accept cancellations or returns. Shipping will be in simple packaging, so please be aware of this.