Eaton’s FHF Ex-Howl Call telephone is a battery and network-independent telephone system for applications under rough conditions, potentially explosive or firedamp-endangered areas. If you require a telephone in an area where this is normally not possible the Ex-Howl Call is the telephone for you, it works on a system according to the dynamic principle, without an external power supply. With simple equipment the signal is generated by turning the rotary knob containing an audio frequency dynamo. 

This telephone is highly efficient and is suitable for conditions in tunnel buildings or mining areas, offshore, or on deep-sea vessels. The Ex-Howl Call has a sturdy, impact-resistant and weatherproof housing ensuring durability and minimal maintenance. 

For years they have proven to be a reliable choice for the mining and tunnel building sectors, at construction sites and for industrial applications with a 10 km range.