58000-030APO Discovery Open-Area Voice Sounder VID58000 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. Key Features: 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