jjrc s1 s2 s3 vs similar udi901 hj808 waterproof turnover reset water cooling high speed boat 25km mini remote control electrictoys gift

main features:.●.waterproof design:.waterproof ring design effectively prevents water from entering the interior during the run.●.streamlined hull:.streamlines body reduces the resistance from water and increase the speed.●.manual fine-tuning:.two-way navigation rudder with left and right two-way swing. the navigation rudder can be manually corrected to the correct direction.when the direction is offset.●.capsize recovery:.helps right the boat upward fast and ensures a normal and safe cruise.●.w