1. High-definition voice communication to prevent background noise;
2. The headphones are comfortable to wear and durable;
3. FSK / DTMF caller ID, automatic detection;
4. 30 group 16-digit caller number access;
5. 5 group 16-digit caller number access;
6. 32-bit pre-dial and relocation function;
7. Backlight use indication, when the incoming call is true, the backlight flashes;
8. The call is automatically and manually answered, and there is an indicator light;
9. The microphone is closed and has an indicator light;
10.2 file headset call volume adjustment;
11. The ringer volume is large, small adjustment and off, and the earphones ring;
12. FLASH time 100, 600ms selection to adapt to different switches;
13.Equipped with a recording interface, can be used for training or connected to the computer sound card for recording;
14. no external power supply, can be used normally;
15. Can be used normally without external power supply.