Feature: Top mounting Audio Monitor ,Audio ,Sound Pickup. Processing Chip: High quality audio digital analog processor, high fidelity, sensitivity adjustable Product. Use the high fidelity digital processing chip, amplify the audio signal via the code and decode technology. It can eliminate the background noise and high frequency interfered voice efficiently. It's electrical noise dynamic closed loop restrained circuit which and eliminate the noise completely. reentrant eliminate which can reduce the serious in the void rooms. Perfect voice. Pure tamber, strong dynamic, built-in AGC circuit. Lots of strong points: low noise, high fidelity,wide operating voltage, low power dissipation and long transmission distance etc. the new sound pickup (audiomonitor ) is the choose for the TV monitoring and safety system. Match use with the camera can realize AV synch. Match use with Audio Monitor: 1.DVR: insert card type or embedded, connect with the audio directly. 2.Connect with the audio matrix, long delay recode, recorder and professional monitor directly. 3., digital optic fiber transmission, UTP transmission, connect with the audio directly. 4.Other equipments with audio input. Can compatible with surveillance board card, no talk between different channels. No need to use audio adapter when matching use with the above equipment Audio Monitor Application: Applied to all monitoring place such as bank, school, prison, hospital, marketplace, factory and meeting system. Specifications: 1 Audio monitoring range:5-150 square meter 2 Operating voltage: 6V-12V DC 3 Current: 20mA 4 Output level: 0-6V 5 Frequency range: 300-5kHz 6 Frequency respond: 2.5dB 7 Output impedance: 600 8 External dimension: D=67mm H=35mm 9 Monitoring area: 5-150 10. User environment: indoor use only, not waterproof Color:as shown Material:Plastic Package Contents: 1x Audio collection microphone (without retail package)(Power adapter NOT included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.