1: Smart body sensor system, very helpful for swimming learing, Waterproof rate reach IP68.  

  2: Working miles can be adjusted accoridng to the needs by adding or minus the batteries.   3: Nice looking, strong power motor,multiple choice , patent, qualified Certificates.

1,One propeller item: Provided free gifts of waterproof cellphone case and sun protection cool sleeve.

2,Two propellers item: Provided free gifts of waterproof cellphone case, sun protection cool sleeve and loss proof rope(shackle including). 3,Three propellers item: Provided free gifts of waterproof cellphone case, sun protection cool sleeve , loss proof rope(shackle including) and the customized carring bag.