USB PHONE 1. Suitable for conference room within 30m2 and microphone covers 3m2. With deep echo cancellation3. Bidirectional noise suppression purifies voice signal from both parties4. Hypercardioid directional microphone plus AGC5. With Hi-fi audio amplifier6. With rare-earth neodymium magnet speaker7. With sonic clear patented voice processing technology8. Compatible with PSTN analog network9. Exterior color: dark gray10. Power requirement: 110 to 240V AC, 50/60Hz, 15W11. Network interface: RJ11 analog PBX or PSTN12. 13. Audio bandwidth: 300 to 3,400Hz14. Reverberation time: <0.4s15. Noise degree: <48dBA16. Humidity: 20% to 85%

USB PHONE TP-PSTN502