- Telephony without power supply
- Protection degree IP 54
- Wide range of accessories
- For rough conditions
If you want or need to telephone in areas
where this is normally not possible,
you need a sound-powered telephone
system. Operation without external
power supply and complex equipment,
sound-powered telephony is ideal
for communications whenever there
is no power supply available, e.g. at
blast furnaces, in tunnelling or mining,
or off shore on oil rigs or high-sea
steamers, and provides a direct connection to the switchboard, base,
bridge or colleagues on the surface.
This surprisingly easy, but effective
method is already used widely to call
for material, report faults or save lives.
The howl-call telephone is a sound-powered device with highly efficient
dynamic transmitter and receiver
cap sules offering communication without power supply. The call signal is
generated by turning the rotary knob
with an audio frequency dynamo.
All telephones are equipped with an
extremely sturdy, impact-resistant
and weatherproof housing and have
suc cess fully proven their worth in years
of oper ation in mining, tunnelling, on
building sites and in industrial operations.
Their range is approximately 10 km.