TurboTech S600 2.4 GHz 4 Channel Remote Control RC Racing Boat 4 channel 2.4Ghz frequency, play 2 boats at the same time. High speed RC Racing boat: up to maximum 20 mph. Built-in water cooling system for safe and reliable operation. Easy-to-use functions: forward, backward, left, right. This racing boat can also right itself! Safety features to protect the battery and the boat: protects from over-charge and over-discharge of the battery. We want to encourage customers to make sure that everything is first fully charged before attempting to play with this product. Once that is done, first have both the transmitter and the boat itself switched off. Then, switch the boat on, followed by the transmitter. After both are switched on, fully move the left joystick up and down so the boat can register and recognize the transmitter's signal. This will finalize the sync-up and the boat is ready to be played with. We advise waiting a few seconds after placing the boat in water for the sensor to kick in as well.