The remote control model is not a toy. This product is provided to adults or experienced technicians with professional remote control model helicopter assembly, setting, commissioning and operation experience and is used in legal remote control flight field. This product is not suitable for children or those who do not have professional remote control model helicopters. Inexperience This must be purchased under the direction of someone with considerable skill or expertise. The remote control model product of this specification belongs to the operator who has high operational skills and is a consumable item.