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Amazon.com: SHIDU Voice Amplifier Teachers with UHF Wireless Microphone Headset, Portable PA System Speaker 10W 1800mAh Rechargeable for Multiple Locations Such as Classroom, Meetings, Promotions and Outdoors : Musical Instruments
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Amazon.com: Voice Amplifier Bluetooth, Microphone Amplifier Wireless 25 Watt Sound System Portable with Mic, 2000mAh Rechargeable Lithium Battery for Kindergartner/Teachers/Tour Gui (S28-Wireless voice amplifier) : Musical Instruments
