Wireless headset headset loudspeaker teacher lectures special bee amplifier set up stall audio Hawking shouting microphone recording speaker loudspeaker speaker player stall

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Color classification:

Black-standard model (long endurance, loud volume)
Black 8GU (long-term battery life, loud horn and loud volume)
Black-wireless microphone version (long-term battery life, loud speaker and loud volume)
Black-wireless headset version (long-term battery life, loud speaker and loud volume)
Black-dual wireless microphone version (long-term battery life, loud speaker and high volume)
Black-wireless microphone wireless headset (long-term battery life, loud speaker, loud volume)

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Color classification:: Black-standard model (long-term endurance, loud volume) black 8GU disc (long-term battery life, loud volume) black-wireless microphone version (long-term battery life