Besides you see a trap transmitter working as follows: A reed switch (closed by a nearby magnet) or any other closed cable loop is showing that the trap is not triggered and the transmitter signals that with a slow pulse rate approx. 10 pulses / min. As soon as the reed switch or any otherwise constructed cable loop opens, the transmitter reacts with fast pulsing. So slow pulsing tells you - I can receive the transmitter from this position and it is still there and working and fast pulsing says, trap is triggered or the batteries are running out of power in both cases a reason to visit the trap
The transmitter comes with telescope antenna, reed switch and magnet.