The single button external outstation is a vandal resistant IP65 bright yellow and black die cast aluminium outstation designed for external use. The unit has an integral microphone and speaker and is fitted with large vandal resistant call button and a call progress. Speaker and microphone volume are adjustable to suite the operating environment with a maximum output of 85dB for noisy areas. The unit is usually mounted in the refuge area and is used by refugees to communicate with the system operator in the event of an emergency. This unit is annotated in black with the words REFUGE ALARM and PRESS ONCE TO CALL, alternative annotation is available on request. The unit is supplied with surface mount back box.