PSTN conference phone,suitable for small conferenc

1. Suitable for conference room within 30m2 and microphone covers 3m 2. With deep echo cancellation 3. Bidirectional noise suppression purifies voice signal from both parties 4. Hypercardioid directional microphone plus AGC 5. With Hi-fi audio amplifier 6. With rare-earth neodymium magnet speaker 7. With sonic clear patented voice processing technology 8. Compatible with PSTN analog network 9. Exterior color: dark gray 10. Power requirement: 110 to 240V AC, 50/60Hz, 15W 11. Network interface: RJ11 analog PBX or PSTN 12. Audio bandwidth: 300 to 3,400Hz 13. Reverberation time: <0.4s 14. Noise degree: <48dBA 15. Humidity: 20% to 85%