Specification: Features:This security microphone for CCTV security camera is compatible with devices that accept AV input, like DVR, VCR, TV, etc. Used to increase a microphone's low output voltage to a stronger usable level. High Sensitivity Audio Sound Pick Up. Sensitivity adjustable. Low noise, high-fidelity. Wide monitoring range of about 10-50 square meter. Specifications:Color: BlackMaterial: PlasticVoltage: DC 9-12VCurrent: 15mAOutput Impedance: 600ohmMonitoring Range: 10-50 Square MeterConnector: Red (DC12V Input), Black (DC12V Output), White (RCA)Cable Length: About 42cmPackage Weight: About 29gPackage List:1 * Audio Pickup Device (Other items in the pictures are not included.)Features: 1This security microphone for CCTV security camera is compatible with devices that accept AV input, like DVR, VCR, TV, etc. 2Used to increase a microphone's low output voltage to a stronger usable level. 3High Sensitivity Audio Sound Pick Up. Sensitivity adjustable. 4Low noise, high-fidelity. 5Wide monitoring range of about 10-50 square meter.PackageList: