Acoustic Deterrent Device

The Lofitech Acoustic Deterrent Device (ADD) is the most effective means of deterring marine mammals.

Wlofitech1arning away seals, porpoises and dolphins ensures the animals’ wellbeing and enables commercial operations to continue.

The ADD consists of a control unit and transducer. The control unit contains a pulse generator and an amplifier to transmit random bursts of audio frequency signals to the transducer. This is transmitted at 191 dB/µPa/m at a frequency of between 10 and 20 kHz, which is optimal for deterring marine mammals without causing harm.


  • Mitigation
  • Fish farm stock protection
  • Fisheries catch protection