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Question & Answer
A Thank you for your inquiry. it have not a plug for the miniature phone plugs that are used on cell phones and headphones,You can use a conversion adapter
A Thank you for your inquiry. Frequency range: 20Hz - 500Hz,500 Hz is the highest frequency
A Thank you for your inquiry,the tubes is Transistor,We do not have stock now,But we has been developed, will soon be on the line, you can pay attention to our website,thank you！
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