Original Lenovo UM20-U K Song Wireless Digital Microphone Live Recording Equipment with Wireless Receiver centrifugeuse "description":"Standard laboratory Hand Refract Meter

"description":"Standard laboratory Hand Refract Meter Erma Japan 0-100%

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Original Lenovo UM20-U K Song Wireless Digital Microphone Live Recording Equipment with Wireless Receiver centrifugeuse "description":"Standard laboratory Hand Refract Meter1. U segment transmission, wireless K song. 2. Intelligent noise reduction, real time ear return. 3. AI smart DSP chip, high fidelity and lossless sound quality. 4. Multiple sound effects make your voice more tuneful. 5. Compatible with iOS Android Windows system. Parameter 1. Working current: 230 260ma 2. U segment transmission distance: 6 10m 3. Signal to noise ratio: 85dB 4. Dynamic range: 80 100dB 5. Total harmonic distortion: 0. 5% 1% 6. USB HIFI