LED luminous  + bell combination
Clamp it to the sea pole, and you can see which sea pole it is when you catch the fish at night!
How to use: Install the electronics in reverse when using it
Then tighten the cover, and install the electronics in reverse when not in use.
If the contact is not good, the light does not turn on, move the metal part and then tighten it!
The battery life is about a few hours. When the electricity is used up, it can be sold in a stationery store with a small battery. Of course, it can be used as an ordinary bell if there is no electricity!