1. Before use, check whether the waterproof gasket of the battery cover is firmly fixed and tighten the screws; 2. Do not pull the tail of the fish when using it. The small fish swims by swinging the tail. If the copper wire of the tail is broken, the small fish will not be able to swim; 3. After use, remember to take the small fish out of the water and dry it, take out the battery and store it in a dry place for later use. 4. If water enters the small fish, first remove the battery cover, take out the battery, wipe away the water stains, wait for the fish to dry, then put in new electronics before use. 5. Please do not leave it in the water for a long time. It can easily cause harm to small fish. In serious cases, it will cause irreparable consequences to small fish. 6.This product is powered by two AG13 button batteries and has a battery life of about 1 hour. You need to bring your own battery to replace it after the power is used up.