§ can be concealed installation § dedicated preamplifier IC § high sensitivity listen § low noise, low distortion § power polarity protection circuit § 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