¡ì can be concealed installation ¡ì dedicated preamplifier IC ¡ì high sensitivity listen ¡ì low noise, low distortion ¡ì power polarity protection circuit ¡ì Connection of DC + RCA
50 to 150 m2 Impedance 600 ohms Frequency of 200 ~ 10Khz Power supply 6 ~ 14VDC Size 7 * 39mm For HaiKang, Dahua DVR device