Babrit Tempo 2.4GHz RC Boat High Speed Remote Control Electric Boat(Only works in water) Suitable only for kids above 14 years old Advanced 2.4GHz automatic code pairing technology allows you to control different boats use different frequencies. 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. Low battery 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(Notice: Do not leave the battery charge overnight.Safety charge time is 120 minutes.Please plug off immediately when you finished charging.)