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1. Energy exchange mode: capacitive

2. Frequency response (Hz): 40hz-16khz

3. Directivity: heart-shaped directivity

4. Output impedance (Ω): 200 Ω

5. Sensitivity: - 40dB ± 2dB

6. Power supply voltage: dc3v / AC220V

7. Effective sound adaptation distance: 50cm

8. With front chime (when opening and closing, there is a "Ding Dong" Prelude sound released) and light ring prompt

9. Length and configuration of microphone wire: 7m single core, card nut + 6.35 mono connector

10. Switch: mechanical self-locking