Single zone audio monitoring system designed for direct connection to a DVR, network camera, video server. When ceiling mounted, the microphone can pick up sounds approximately 15′ away or within a 30′ diameter circle. Model IF-1 Interface Adapter receives the wiring from the microphone, supplies power to the microphone and drives the audio signals into the audio input of the recording device. Kit includes an RCA cable for connecting to a DVR or VCR, and a 3.5mm cable for connection to a computer sound card. It also contains a variable gain adjust to prevent overdriving or underdriving the audio signal. Kit Contains: Microphone IF-1 Interface Adapter 12 Vdc Power Supply Single RCA cable 3.5mm Mono to RCA Adapter 3.5mm Stereo cable NOTE: Speaker/Amplifier not included. If audio playback from a DVR/VCR is required, you may need to purchase the ASK-4KIT-101.