Works well. I plan to use it during a speech I have to give in the near future. There are batteries from China. I replaced them with 1.5v Duracell batteries and they didn't work. Replaced them with 1.2 volt Rayovac Triple A rechargeable batteries and the product worked fine. Batteries made in China are probably not really 1.5 volt triple A, but slightly lower voltage. Perhaps the button product was designed to work on Chinese batteries.
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