China Industrial Telephone, Weatherproof Telephone for Tunnel and Railway and Mining, Find details about China Mining Telephone, Industrial Telephone from Industrial Telephone, Weatherproof Telephone for Tunnel and Railway and Mining
Operating: | -30°C to +65°C |
Storing: | -40°C to +75°C |
Ringing Tone | Shrill warble tone 90 dBA @ 1 metre typical |
M.T.B.F. | Calculated to have an M.T.B.F. in excess of 50,000 hours using |
Dialing | MF (tone) |
Lightning / Transients | Protection to ITU-T k.21 enhanced levels |
Weather Resistance | IP66-IP67 |