Up for sale is a vintage Shure Brothers model 580SB Unidyne A dynamic cardioid microphone made in the USA. It has an on/off switch and permanently attached 3-pin XLR cable. The output signal is balanced, as opposed to the model 580SA with is unbalanced). This is a popular mic for harp and harmonica players. This mic sounds good and the on/off switch functions properly. Please take a close look at all the photos as they ae also apart of the item's description. Also, please check out my other listings!