UDI U003 2.4GHz High Speed RC boat - White by UDI RC Comes equipped with a water cooling system to prolong the life of the boat. Advanced 2.4GHz automatic code pairing technology allows you to control different boats use different frequencies. Low voltage alarm - When the battery runs low, the transmitter will sound "di, di, di" this warns you about 1 minute left, so you can sail it back for retrieval. When the 2.4G Signal becomes weak, the transmitter will detects and flashes an out-of-range light. Capsize recovery function - The self-righting feature lets you command your boat back into action if it capsizes. NOTE: The transmitter distance is: 80m, if it is beyond that distance, the boat will not be able to communicate with the remote anymore. This product will warn you when the battery is running low so you can run it back to where you are. Li-ion batteries should never be overcharged or over-discharged, it is best to bring it back and recharge as soon as you hear the low battery warning.Do not over power it especially after the low battery warning. Please make sure before the first flight/run that the battery was fully charged for a long period of time to refresh the battery. Please also check the remote controllers batteries are full. It is best to try powering the boat in water. There are sensors at the bottoms and sides of the boat and the motors will sense the water in order to operate. Best-practice preventative tips from our RC experts for longer product use: Waterproof the running gear and electronics by greasing all shafts and electronic connections before putting it in the water. (Recommend general purpose greasewill protect against washout, rust, and corrosion). If using in salt water, rinse the boat with a garden hose after use and let it drip-dry upside down