370167 – BATTERY TELEPHONE 12-EXT. LINE, WALL-MOUNTING TYPE

IMPA 370167 – BATTERY TELEPHONE 12-EXT. LINE, WALL-MOUNTING TYPE – 1) 1: 1 Communication system using relay box. This system is used when communication between two parties is required. (Fig. 2) 2) 1: 2 and 1 : 3 Communication systems using selector box. These systems are used when communication is required between a master extension and a number of slave extensions.(Flg.3) Relay box and selector box are sold separately.