1. Audio conference representative unit.

2. Chair unit has the priority to control the whole meeting procedure.

3. High-directivity loudspeaker with circle-shape sign light (red).

4. Inside of each unit is earphone interface with good sound quality and volume adjustment buttons.

5. Non-source power supply by system main unit, input voltage 24V (safe).

6. Squeal suppression function, when the microphone is open, the internal loudspeaker would be self-closing to avoid voice feedback.

7. “Hand-by-hand” serial connection for installation and maintenance convenience.

·Power: DC24V(main unit power supply)；

·Unit interface: specific interface；

·Power consumption；

·Earphone output: 9dBu，8-32Ω，3.5mm minitype socket；

·Loudspeaker power；

·Microphone type: Capacitive membrane；

·Directional characteristic: “Heart” pattern；

·S/N: >80dB；

·Crosstalk attenuation: >80dB；

·Distortion: <0.10%；

·Frequency response: 60-10kHz；

·Equivalent noise: ≈20dB SPL；

·Max.SPL: 105dBv/Pa；

·Sensitivity: -22dBv/Pa；