Features:
| 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 |