Cordless Microphone (PAIR)
https://www.bietrun.com/%E5%89%AF%E6%9C%AC-wireless-bluetooth-microphone-ma
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Frequency band: U band.
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Number of channels: 15 Set channels.
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Receiver battery capacity: 650 mAh polymer battery.
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Receiver working hours: 4 hours.
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Connection distance: 160 feet (in classroom).
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Receive sensitivity: 130dB.
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Microphone power: AA battery.
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Housing material: aviation aluminum alloy.
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How to use: Plug and Play.
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Volume adjustment: 5 levels.