1、Tone/Pulse, compatible with various communications platforms;

2、Redial；

3、Mute;

4、Flash

5、Desk and wall-mount;

6、Anti lightning/Electro interaction;

7、Waterproof, moistureproof.  

  1) Operating conditions:

   Environmental temperature: -10~ +40℃    

  Atmospheric pressure: 86~ 106Kpa

  Relative humidity:  10%~95%      Environmental noise:  ≤60dB（A）

 Working Frequency: 300~ 3400Hz

  2) Characteristics of dual-tone-dialing

 ● rated low frequency group frequency: 697HZ   770HZ   852HZ   941Hz。

 ● rated high frequency group frequency: 1209HZ  1336HZ  1477HZ 1633Hz。

 ● The tolerance of single frequency within ±1.5% of rated frequency

 ●Voltage level of single frequency of low frequency group in DTMF signal:  -9dBM±3dB。

 ● Voltage level of single frequency of low frequency group in DTMF signal: -7dBM±3dB。

 ● In any frequency combination, the voltage level of high frequency group is higher than that of low frequency group:  2±1dB。

 ●The total voltage level caused by the intermodulation of frequency wave is lower at least 20db than the voltage level of basic wave.

  3) Characteristic of ring:

    The sound level of ringing under normal tintinnabulation: ≥70dB（A）

  4) Sending, receiving loudness rating (SLR & RLR) and Side-tone masking rating (STMR):