Dear sir,
Sorry for the late reply.
We have gone to the NingBo Custom to ask for the related information. Just as Nick's email, our HS Code is made according to the products itself, not by the use of the products. NingBo Custom is not sure whether it can be adjusted and they need our more materials (such as the actual product use, the product manufacturing process). They need to enquire from their leader office. It will take about one or two weeks.
Deeply sorry for the inconvenience.