Apollo 58000-030APO Discovery Open-Area Voice Sounder VID - Red Body (Red Flash)Apollo 58000 030APO Discovery Open Area Voice Sounder VID Red Body (Red Flash) Isolating Discovery Open Area Voice Sounders comprise a sounder and a sounder visual indicator that have been designed to provide clear instructional messages through the Discovery protocol. They are loop powered wall mounted devices. Four pre set message pairs Capable of up to 15 tone message pairs Low current and high volume Fully synchronised Set up and test at point of