How to adjust the polar bear fish catcher to the best mixing frequency and the best main frequency

Low pressure is used for shallow water below one meter, and high pressure is used for water depth exceeding one meter, depending on the water depth. When the water is clear, use the main frequency, so that the fish will not run away. If the water is turbid, use stirring, so that the fish have a chance to surface. Generally, the main frequency is adjusted to 6 or 7, preferably to 7 or 8. The working principle of the electronic fish catcher is: the heart and brain nerves of all cold-blooded animals, such as fish and soft-shelled turtle, are stunned by ultrasonic waves, but the oxygen is removed, so that they can quickly surface in a large area to achieve the best fishing effect. Deep-seated animals can be fished at will after being stunned (revived after 5 minutes), and the large ones are left behind, which does not affect reproduction, and is absolutely safe for human bodies and warm-blooded animals.