The AviTrac 18s birdscarer is an electronic unit that emits a huge range of different distress calls and predator noises to keep birds off crops and away from yards / buildings. It is powered by a 7AH rechargeable battery with up to 3 weeks battery life (at 20 minute interval between sounds). With 2 x 120dB speakers it can cover an area of 4 hectares. It is easily transported, weighs 10kg, has a foldable metal stand, and is fully waterproof. It is fully programmable with over 150 different signals, on/off timer, interval timer, and volume adjustment.
It is very efficient against crows, pigeons, seagulls, starlings.