1. Power supply mode: AC~220V-230V, 50/60Hz
2. Optional: 2 in 2 out models
3. Automatic anti-howling effect when the microphone is turned on
4. Frequency shift amount: 5Hz±1Hz
5. Sound transmission gain boost: 5-14dB
6. Line input impedance ≥5KΩ
7. Line output impedance≤600Ω
8. Frequency response: non-shifted state: 20Hz-20KHz
9. Frequency shift state: 150Hz-15KHz