Check the listing for details. Novastar PSD100 LED Asynchronous Controller Recovery SD Disk. Condition: For parts or not working. Listed at 50.00 USD. Novastar PSD100 LED Asynchronous Controller recovery disk. PSD100's have a tendency to stop working for no reason. They are a Windows based controller, it seems that they develop Windows operating system problems. This disk will return the controller to working original condition. In most cases, the yellow led on the PSD100 controller stops lighting or flashing. You install this SD card into the controller SD slot. Power the controller up, and usually within 5 minutes, the yellow led will be blinking, and the controller is working. You power down the sign, remove the sd card, and then you reconfigure the controller to match the sign. This is not a fix for all PSD100 problems. Sometimes it might fix it temporarily and the problem comes back. Sometimes you have to use this sd card every six months or so. You will receive a programmed SD card. It may not look like the photos. Controller in photos is not included. Sold as is. No returns. ***Controller will require configuration to match sign***.