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When using a wireless microphone, there is no way to find out whether it still has power, and the users can only test it repeatedly. If a microphone runs out of power when a speaker is delivering a passionate speech, this not only stops the speech, but also makes the speaker nervous.
“Simple light” is designed for this problem. The lighting display at the front end of the microphone can warn and inform the speaker in advance.
Taichung City, Taiwan