If your quarry is closer than 20mts you might pick it up, 10 mts seems to be about max reliable range. No I am not taking the piss. 2 mates bought them and that was about the extent of their reliability. That is in the open any bush in the way shortens that to almost 0. Even if the mates are exaggerating then 20 or 30 mts reliability, I wouldn't waste my money.