GRINNELL AUTOCALL SIMPLEX MAIN PROCESSOR BOARD FOR TFX-800 SYSTEM MODEL MP 940500 FIRE ALARM.. 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.