'Type B' intercom style outstations offer true hands-free duplex speech to allow anyone in a refuge area to communicate with building control at the touch of a button. Attractively finished in green steel or stainless steel, they includes connections for an optional induction loop system and a general-purpose relay output that closes on activation of the unit. Flush, surface and weatherproof versions are available. Connect to central control equipment using two cores of 1.5mm sq. enhanced fire rated cable.