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The Wheelock Series Cluster Speakers are designed for ceiling or wall mounting for high ambient noise environments. The Cluster Speakers are available in multiple configurations. A speaker/visual (Series STH-MSR) and speaker only (Series STH-R or STH-G) alerting system. All alerting systems are equipped with UL listed STH-15SR or STH-15S supervised horn loudspeakers and the speaker/visual system has a UL listed DC-MAX-C strobe, mounted to a steel enclosure.