The underwater sonar detection system consists of three main parts: a fixed-frequency transmitter, a frequency-modulated transmitter, and a receiver. The transmitter can be fixed on underwater equipment,
Divers can continuously track the location of the transmitter by adjusting the receiver in their hands. The transmitter can adjust pulse frequency and power, and is powered by ordinary
alkaline batteries. Depending on the transmission power, the transmitter can operate continuously for several days to several months. Once placed in water, the transmitter
automatically starts working. The receiver can receive frequencies from 3 to 97 kHz. When the user points the receiver towards the transmitter, the receiver will emit
a sound, and the LED light will flash as a prompt. A pointer fixed at the top serves as a guide to lead the user to the transmitter's location. The closer to the transmitter,
the louder the sound and the faster the LED flashes. The receiver is rechargeable and can operate continuously for 30 hours when fully charged.