Product Name: Ht-6600b Series Multifunctional Conference System Wired Microphone Model NO.: HT-6600B HT-3900 HT-3910 Color: Sliver or Black Pointing Feature: Hypercardioid Communication: Wired Composition: Conference Controller + Conference Microphone Video: Without Video Type: Voice Conferencing System Trademark: HTDZ Transport Package: Carton Origin: China Product Description Conference control unit HT-6600BMain Functions:It directly powers and controls 60microphone units.Chairmanmicrophonehas priority function. Fiveoperating modes: FREE MODE, LIMIT(1-9), FIFO (1-9),TIME SETTING(COUNT UP or COUNT DOWN for microphones)One microphone input (MIC) and one line input (LINE) for external units.TAPE output for recordings and line output (LINE) for amplification (balanced and unbalanced).It allows insertion of an audio processor to the chain.Microphone sensitivity level control.Loudspeaker level control for the unit monitorsConference microphone HT-3900c/d & HT-3910c/d seriesMain Functions:Support discuss and camera video-tracking function with each microphone has its own ID number.The system power supply for all microphones is provided by the main unit HT-6600B at 24 safe voltages. Microphone with OLED display screen, showing the local date and time(set by software on PC), also showing the speaking time when microphone under the speaking mode(Time counting up or time counting down).Built-in high-fidelity speaker and 3.5mm earphone jack on the microphone base(HT-3910c/d).HT-3900c/d conference microphone: (cfor chairman unit, d for delegate unit)HT-3910c/d conference microphone: (cfor chairman unit, d for delegate unit)Technical Parameter for microphone unit:Connection type: 8P-DINEarphone jack:3.5mm Mini Jack(HT-3910c/d)Rec output:3.5mm Mini Jack(HT-3910c/d)Sound pick-up distance: 20-50cmFrequency response: 40Hz-16KHz.Sensitivity:-44dB +/- 2dBS/N ratio: 85dBLength of gooseneck mic: 42cmConsumption: <2WDimension: HT-3900c/d : 207 x 117 x 60 mm HT-3910c/d : 210 x 138 x 52 mmN.W.: HT-3900c/d : 0.7kg ; HT-3910c/d : 0.83kgSystem Connection Diagram (For example):For more details information about the product, please do contact us anytime!