(1)  Range
 Can be used in the explosive, gas dangerous places,suitable for the industry  of oil,chemical industry, 
oil refining, wharf, fire, power plant, steel etc.
   (2)  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 IP65 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≤30 ohm, service life ≥2 million,push force 160-200 grams,good hand feeling.
10.The handle uses imported PC explosion-proof plastic material, thermostability of the PTFE wire,. The military antinoise transmitter, clear conversation in the 115dB environment.
11.Hook adopts magnetic induction swith,life cycle ≥ 500 thousand

   (3) 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 A20 TA,T6
Defend grade   IP65
Working voltage AC220V 50Hz
Wait\working current ≤0.2A
Rated power 20w
Frequency response 250~3000 Hz
Ambient temperature -40~+60°c
Atmospheric pressure 80~110KPa
Relative humidity ≤95%
Amplify output power 10-25w
Effective distance of the call 5Km
size 343*294*206mm
Outlet thread G-3/4”
installation wall-mounted
Weight   12kg