§ pinhole into the audio port § circular volume with fixed supports § can be concealed installation § dedicated preamplifier IC § high sensitivity listen § low noise, low distortion § power polarity protection circuit
50 to 80 m2 Impedance 600 ohms Frequency of 200 ~ 10Khz Power supply 6 ~ 14VDC Size 13 * 50mm For Kang, Dahua DVR device
Product Description 
