China Emergency Call Industrial Telephone with Lound Speaker Vandal Resistant Intercom, Find details about China Underground Industrial Telephones, Handset Speakerphone from Emergency Call Industrial Telephone with Lound Speaker Vandal Resistant Intercom
Operating Temperature | -30°C to +65°C |
Storing Temperature | -40°C to +75°C |
Ringing Tone | Shrill warble tone 80 dBA @ 1 metre typical |
M.T.B.F. | Calculated to have an M.T.B.F. in excess of 50,000 hours using |
Lightning/Transients | Protection to ITU-T k.21 enhanced levels |