This is a set of two units. Power and rotation have been confirmed, but detailed operation and sound output have not been checked. The lights on two of the units in my hand are out, and one switch dial light is out. There are no cracks in the covers. Please refer to the images for the detailed condition. Since the operation has not been confirmed, we are selling it at a low price. Please understand the above before making a purchase. We can offer a small discount.