YAMAHA silent BRASS PM Silent Brass Model number unknown. There are some minor dirt and scuffs. Please check the photos for size and condition. This is for the mute microphone part only. The personal studio part is not included. We have not been able to confirm its operation, so it will be treated as junk. Instruction manual and box are not included. This is a pre-owned item, so the purchase date is unknown. As it has been stored at home, there may be some minor scratches on the container. Please refrain from purchasing if you are sensitive or concerned about minor details. As this is stored at home, please consider and purchase with understanding. Please feel free to contact us if you have any questions.