¡ì with the interface sensitivity can be adjusted ¡ì Senior microphone suppress ambient noise ¡ì a large area into the wider mining tone of the sound port ¡ì Built-in noise reduction processing circuit ¡ì power polarity protection circuit ¡ì Connection of DC + RCA
10 to 100 m2 Impedance 600 ohms Frequency of 200 ~ 10Khz Power 9 ~ 14VDC Size 39 * 31 * 18mm For HaiKang, Dahua DVR device