SK-FFT SILENT KNIGHT Fire Fighter Telephone Control PanelThe SK FFT is a Fire Fighters Telephone Communication System. The SK FFT with keypad, provides indications of phone activation, and corresponding trouble conditions. The FFT 24 expander board lets you add additional zones to the SK FFT. The SK FFT can use one FFT 24 for a total of 48 zones. Each zone consists of one addressable monitor module (SK Minimon) and a minimum of one Fire Fighter Telephone Jack (FFT FPJ). Additional information Weight 16 lbs