La description

 Features
1.The communication system can be independent and composed with telephone,program-controlled switches and coupler.
2.Can be directly connected to a telecommunications network
3.Telephone amplifying sounds’s volume can be adjusted according to their environment.
4.Automatic amplification function and broadcast function
5.The telephone circuit uses the universal double integrated circuit, with the advantage of  hair Accuration,
clear communication and stable work.
6.The degree of protection IP*5 can apply to damp, dust and corrosion and other harsh environment.
7.The shell of telephone’s design is patent, waterproof, dustproof, without waterproof cover, beautiful and practical.
8.Shell is made of silicon aluminum alloy die casting and the surface temperature of antistatic spray,applicable to
a variety of harsh environment, high mechanical strength, strong shock resistance.
9.Using our patent stainless steel keyboards, contact resistance≤*0 ohm, service life ≥2 million,push force ******0 grams,good hand feeling.
*0.The handle uses imported PC explosion-proof plastic material, thermostability of the PTFE wire,. The military antinoise transmitter, clear conversation in the **5dB environment.
*1.Hook adopts magnetic induction swith,life cycle ≥ **0 thousand

   Using method
  Pick up the phone to call another explosion-proof explosion-proof telephone, after 6 ring bell automatically switch on the speaker, and expand the broadcast calling. The called
party take off the hook after hearing the call (1 minutes nobody take off the hook will automatically hang up), the
speaker is automatically closed, both sides can talk.

    Explosion-proof mark  Exd[ib]ib II BT6 DIP A*0 TA,T6
Defend grade   IP*5
Working voltage AC**0V *0Hz
Waitworking current ≤0.2A
Rated power *0w
Frequency response **0~***0 Hz
Ambient temperature **0~**0°c
Atmospheric pressure *0~**0KPa
Relative humidity ≤*5%
Amplify output power ****5w
Effective distance of the call 5Km
size **3***4***6mm
Outlet thread G*3/4”
installation wall-mounted
Weight   *2kg