In the embodiment, an upper surface of the detector body 10 is equipped with a pointer meter 70, which is electrically connected to the control board 50. The control board 50 controls rotation of the pointer meter 70 based on the signal transmitted by the signal receiving end 12. By such arrangement, the control board 50 controls the pointer meter 70 to rotate based on the signal transmitted by the signal receiving end 12. Users can intuitively understand a strength of the signal through the position of the pointer, and quickly find the strongest point of the signal based on the strength of the signal, thereby finding the position of the signal transmission device, which is more convenient to use.

In the embodiment, the upper surface of the detector body 10 is equipped with an indicator light 51, which is electrically connected to the battery 60. The indicator light 51 is used to indicate remaining capacity of the battery 60. By such arrangement, users can use the indicator light 51 to intuitively understand the remaining capacity of battery 60, which is helpful for understanding of the battery life. This facilitates timely charging or battery replacement, improving user experience.

In the embodiment, the upper surface of the detector body 10 is equipped with a switch 52, which is electrically connected to the control board 50. The switch 52 is configured to turn on or off the circuit. The switch 52 can facilitate users to turn on or off the detector body 10, thus saving power when not in use.