YAMAHA Silent Brass SB3 for French Horn ・Pickup Mute PM3 ・Personal Studio ST7 ・Adapter ・Earphones ・Cable I have confirmed that there are no problems with use by attaching it to a French horn. There is no instruction manual. Please note that the outer box has some damage. Also, the original cushioning material inside the box is missing, so I will pack it with cushioning material such as bubble wrap for shipping. Please understand that this is a used item before purchasing.