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It includes the Sound Alert jackbox, eight matching 2924AVG monaural headphones and a rugged carry case. With the sound level controlled from its jackbox, the listening center can safely keep the volume to a safe 85 decibel level. When the jackbox volume exceeds 85 decibels, a bright red LED warning light turns on, alerting both the teacher and students about the unsafe sound level requiring adjustment. This visual cue not only helps correct the current situation, but will also help students l