For Sport & competition sailing. Teaches hands on skills. Explore wind navigation science. Length 11 inches, Width 3.3 inches, & Height 17.5 inches. 2- channel control. Transmitter controls the sail angle & the water rudder. Equiped with 2 9-gram servos, 3.7V 150mAh Li-Po battery. Li-Po battery charger is built into the transmitter. Comes in three colors - Blue, Red, or Green.