Up for bid is a used, but in solid working condition TFX OXM-501 RM/SDA Motherboard, AutoCall, Grinnell, Thorn, Tyco, Simplex as seen in picture. This came out of a working system that was fully functional a 100% the system was upgraded to newer system. I have a large number of All autocall/grinnel equipment available! Plus you get free Expedited Shipping but if you want different then it's extra. Please checkout my other other ebays on the Grinnell/Simplex Fire Protection System. This is priced to sell with plus free shipping. Everything IS GUARANTEED TO WORK.