| 50~100 ㎡ |
| 1000 ohm impedance |
| Frequency 300 ~ 14Khz |
| Power 6~12VDC |
| Size Φ72*41mm |
| Suit for popular DVR devices |
| |
| Original Voice & No Noice |
| AGC Gain Circuit |
| USA Imported IC,German Solution |
| Accidented Designed for reduce reflection |
| 2mm pinhole designed |
| Japan imported silver microphone capacitance |
| Dynamic closed-circuit noise |
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