An AP APCD-600 chain disk usb control unit. These units were surplus to operations from a factory sale. Appear to be new in the box. Control unit and usb as shown. I do not know any more info than stated here. New units online appear to be $806. Photos show the condition well. Please see the photos and email any questions. Buyer pays shipping, I will combine shipping. Please email after the auctions are done so I can combine the shipping costs as the calculator will not do it automatically. I will ship as soon as payment is received. Check out my other items!