China Tunnel Waterproof VoIP Intercom Systems Vandal Resist Industrial Telephone, Find details about China Wireless Emergency Phone, Alarm Phone System from Tunnel Waterproof VoIP Intercom Systems Vandal Resist Industrial Telephone
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 |
Lightning/Transients | Protection to ITU-T k.21 enhanced levels |