Blomiky H100 2.4GHz 4CH Automatic Capsize High Speed Racing RC Boat Waterproof Remote Control Boat Extra 2 Battery TKKJ H100 Ship Blue Extra 2 Battery gift(each value $9),Total include 3 battery in package, If need more battery,choose ASIN: B06ZY6J1P8 . Race at 15 MPH (25 km/h) and blow other remote control boats out of the water! Do extreme sharp turns and auto flips (self-righting feature lets you keep your boat in play even if it capsizes). Correct capsize method video:https://youtu.be/DfqLloR40BU 4 channel (Forward, Backwards, Left, Right) 2.4GHz frequency controller allows multiple boats to be raced at the same time Reset video Trim link:https://youtu.be/LcUrvR7F4Lg Whatever left-hand or right-hand mode, push left throttle left directioin, at same time push right throttle right direction,then release two throttle, it is calibrating method. Slow adjust Trim:Push "ST-TRIM L" button,don't loosen, the tail vane will turn left slowly. push"ST-TRIM R" button don't loosen,the tail vane will turn right slowly Summer toys for kids, Remote control Boat ship for lake pool sea river.Features a water-cooled, single-prop powerful motor for safe and reliable operation and a rugged ABS anti-tilt hull that combines style, speed and affordability..Low battery alarm warns you when the RC boat is almost out of power so you know when to head for the shore. Safety features to protect the battery and the boat: protects from over-charge and over-discharge of the battery. 20KM/H High Speed Automatically 180 Degree Flipping Transmitter with LCD Screen.detail see manual.