China Vandal Resistant Telephone Prison Phone Landline Telephones, Find details about China Hook Emergency Intercom, 3G&GSM Industrial Telephones from Vandal Resistant Telephone Prison Phone Landline Telephones
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. | excess of 50,000 hours using |
MF (tone) | MF (tone) |
Lightning /Transients | Protection to ITU-T k.21 enhanced levels |