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Comments about Standard Horizon MH-57A4B Mini Speaker/Microphone:
We bought two of these. Same problem with both. I use the product as a hand mike attached to my lapel or shirt collar. It is great when it actually works but that is only 50% of the time. When it works I can hear radio traffic in a noisy outdoor environment (upside) When it doesn't work I can't transmit to others without unscrewing the microphone or relaying through a base unit (downside). The difficulty in transmitting is not worth the trouble of not being able to transmit.