l       We are a member of trade assurance on Alibaba, if you import goods via it, 

       Alibaba will  be full rufunds protection if goods itself has quality problems. 

l       We can return your money if you are not satisfied with our product within 7 days

       after you get the goods, you only need take the freight.

l       We promise to replace the goods freely if there is some problems within 6 months.

l       Free maintenance within 2years, you just need to pay the freight.

• QWhat kind of brand do you use for controller and display?
• AKT, Sciencewell, and Xi-tong. Both controller and display for one set. Other brands are optional.
• Qwhat kind of brand do you use for cell box, cell, power-off brake?
• ACell box: ShanShan and Huiye
  Cell(18650): Samsung,Yiklik
  Power-off brake: Wuxing
  Other brands are optional.
• QThe controller uses square wave or sine wave?
• AIt is optional.
• QThe kit uses gear motor or gearless motor?
• AIt is optional.
• QThe controller uses square wave or sine wave?
• AIt is optional.
• QWhat is the largest power of your motor for the kit?
• A1000w
• QWill the conversion kit fit my bicycle?
• AThe conversion was designed to fit 90% of the bicycles, and you can check your bicycle fork (the two 
  metal pieces that attach the wheel to the bicycle) to be sure. You will need at least 100mm for front wheel and 135mm for rear wheel.
• QDoes the electric bicycle waterproof?
• AYes. You can ride our electric bikes in the light rain without worrying about damaging the electric components.