2.4G remote control shark function: multiple people can compete at the same time (without interfering with each other) and imitate the swimming movements of fish. Swim on the water. Remote control shark operation: 1. Please fully charge the battery when you receive it, the charging time is about 30 - 60 minutes. 2. Connect the battery to the shark, please tighten the battery cover. 3. Put the shark into the water until the blue light turns on (there is a water sensor switch at the bottom of the fish, put the fish into the water, and the blue light on the back of the shark turns on). 4. Turn on the controller (the remote controller needs to be as close to the shark as possible. If the red light on the remote controller goes out, it means the remote controller is successfully linked to the shark.) Beware: 1. The remote control cannot be exposed to water. 2. Children need the guidance of guardians when playing. 3. It is not recommended to use it in the sea to avoid being washed away by waves. 4. Guardians should take good care of their children to prevent them from falling into the water. 5. The shark must be placed in the water for the engine to operate normally. 7. Due to different monitors, the product may have color differences. 8. Use in fresh water, avoid operating in salt water for too long. packing list: 1* Remote control shark 1* Controller (batteries not included) 1* battery (built in Shark)