Share the same power source with the camera, no additional power adapter needed.

BEST CCTV MICROPHONE FOR SECURITY CAMERA - The security microphone for CCTV security camera is compatible with devices that accept AV input, like DVR, VCR, TV, and any low-frequency amplifiers

AUDIO MICROPHONE HAS Qualitative Preamplifier used to increase a microphone’s low output voltage to a stronger usable level. High Sensitive Audio Sound Pick Up. CCTV DVR audio microphone is guaranteed to work more than 5,000 hours.

micro audio system has power DC 6 - 12V, 13 inches cable attached to the 3 connectors. Low Noise, High - Fidelity, Frequency response: 3005500Hz.

worry-free 1 year warranty and friendly customer service，90-Day Money Back Guarantee. 3-7 days delivered from TX, US.

High sensitivity,Built in on board IC preamp, low noise, high gain and auto level adjustment,Compatible with devices that accept AV input, like TV, VCR, DVR. Features: 1:Plug and Play 2:High Sensitive 3:Higher S/N Ratio 4:Range : 150 Square meters 5:Audio Output: RCA Female 6:Sensitivity : 200mA/ubar 7:Work current : 5 mA-60mA 8:Work Voltage: DC12V 9:Frequency: 200-6000HZ 10:Max output Voltage: 5V-upp How to get it work 1. Connect add-on microphone to the camera. Secure the microphone from rain or snow. 2. Go to NVR’s main menu – System setting - CH setting - Encode setting, change Encode Mode to AV Stream, save it. 3. Now you get audio from this camera. Note: You need to change Encode Mode to “AV Stream” for all channels that you have added microphones. How can you hear the voice? 1. Through the app, turn on audio on app, you can then hear the voice from your phone. 2. Plug a headphone to the NVR’s audio output, you can hear the voice from the headphone. 3. Connect NVR to a monitor/TV via HDMI cable, you can hear voice on monitor/TV, as HDMI transmits audio. 4. Backup the videos and playback them on computer, you can hear the voice. Package * 5x Microphones for Security Cameras