UTM model series "B" Universal Tone Module Fire Alarm TFX AUTOCALL GRINNELL THORN SIMPLEX.. 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.