This WinBridge WB001 Rechargeable Ultralight Portable Voice Amplifier is a great little amplifier, i used it in a medium size room with about 45 people and a larger room with about 80 people. The sound is clear and loud enough for all to hear. It charges pretty fast with a usb block charger that came with it. If you are a teacher, class leader, Sunday School teacher, Coach and need a louder voice this is a great deal. It also has a great volume range to be used in or outfoors. I think you will be well please with this purchase. You can't beat the price and it arrived fast.
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https://www.amazon.com/WinBridge-Rechargeable-Ultralight-Presentations-Etc-Black/dp/B014JJG43E