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Amazon.com: SHIDU Mini Voice Amplifier Portable Rechargeable Bluetooth Speaker with Wired Microphone Headset 10W 1800mAh PA system Supports MP3 Format Audio for Teacher, Taxi Driver, Coaches, Training, Tour Guide : Everything Else
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Amazon.com: SHIDU Portable Voice Amplifier for Teacher with Microphone Headset, 2000 mAh Personal Speaker, Rechargeable Support MP3 LED Screen for Teachers, Tour Guide, Coaches, Classroom (Pink) : Musical Instruments
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Amazon.com: Voice Amplifier MAONO Portable Rechargeable Mini Speaker with Wired Microphone Headset and Waistband, Support FM MP3 TF Card for Teachers, Coaches, Tour Guide, Classroom, Outdoors, C01 : Musical Instruments