WinBridge Bluetooth Voice Amplifier for Teachers, Wireless Voice Amplifier with Bluetooth Headset Microphone, Portable Megaphone Speaker Headset System, Teacher Must Haves 15W WB002Brand: W WINBRIDGE Color: Black Features: Teacher must haves: WB002 Bluetooth voice amplifier can be a thoughtful and practical gift for a teacher who frequently speaks in front of large groups or classrooms. 15W powerful output could cover 10000 sq. ft,kindly recommend use this portable headset microphone speaker system indoors like classroom,it's plenty loud for a class of around 50 middle schoolers to hear you. Easy Pairing and Operation: Wireless

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