China Correctional Telephone, Prisoner Telephone System, Inmate Telephone System, Find details and Price about China Inmate Telephone, Heavy-Duty Telephone from Correctional Telephone, Prisoner Telephone System, Inmate Telephone System
| Telephone Versions | Analog,SIP,GSM,3G optional |
| Operating Temperature | -30°C to +65°C |
| Storing Temperature | -40°C to +75°C |
| Ringing Tone | 80 dB @ 1 meter typical |
| M.T.B.F. | excess of 50,000 hours using |
| Power Supply | telephone line or DC or solar powered |
| Weather Resistance | IP54-IP65 |
| Casing Material | vandal proof aluminium body |