This LED Deep Drop Underwater Fishing Lure Light is using ultrasonic wave of sound and light to gather them together then catch. It will light Red color and sent special light-wave after installing the coming three button cells. It is waterproof, so you can put it in the fish net or tiy with another fish line and together throw into the water with the fish lure, that will Increase fishing opportunities and make fishing easily. If water penetrating accidently, pls take the battery out and wipe dry, then it can be used again. Also it is beautiful views that see the fish swimming to the lure light at night